Climates of India | CBSE Class 7 Geography Notes

This note covers weather, seasons and climate, India’s regional climatic patterns, factors controlling climate, summer and winter monsoons, links with culture and livelihoods, climate-related disasters, climate change and ways of responding to its effects.

How do weather, seasons and climate differ?

Weather means the conditions experienced each hour or day, such as rain, sunshine or wind. Climate means a region’s pattern of weather over a long period, extending across several decades at least. A rainy day describes weather; a long-term pattern describes climate. Temperature describes how hot or cold the air is.

Seasons are periods lasting a few months that recur every year as Earth revolves around the Sun. They connect weather with climate. Weather changes through the seasons, while the recurring seasonal pattern is part of a region’s climate.

How does the yearly cycle affect life?

Across most regions of the world, the four main seasons are spring, summer, autumn and winter. India also receives rain during a particular part of the year, called the rainy season or monsoon. The word monsoon also has a more precise meaning connected with winds.

Traditionally, in many parts of India, the year has six ritus, meaning seasons: vasanta or spring, grishma or summer, varsha or the rainy season, sharad or autumn, hemanta or pre-winter, and shishir or winter. Vasanta Panchami and Sharad Purnima are associated with this seasonal cycle.

Crops, food and clothing change with the seasons. Depending on the region, some plants flower in spring, and in some places trees lose leaves or change colour as autumn approaches. Some animals grow thick fur during cold winter months.

Note: Climate usually remains stable over long periods. Nevertheless, scientists have recorded recent changes, and studies show that many of these changes have been caused by human actions.

What different climates are found across India?

India has several climatic patterns, reflecting the variety of its mountains, plains, deserts, coasts and plateaus. These differences affect what people grow, how they dress and how they obtain water. A single description of India as hot or rainy leaves out this diversity.

How do northern and western regions differ?

The name alpine comes from the Alps, a European mountain range. Many hill stations offer relief from the heat of the plains. Most of India’s wheat grows in the northern plains, while people in the Thar have developed distinctive ways to collect and conserve water.

How do coastal and peninsular climates differ?

The western coastal strip has a tropical wet climate, characterised here by heavy rain during the monsoon months. These conditions favour rice and spices. The central Deccan Plateau has a semi-arid climate, with hot summers, mild winters and moderate rainy-season rainfall.

Eastern India and the southern peninsula have a tropical climate, with mild winter conditions and distinct wet and dry periods controlled by monsoon winds. The terms tropical and subtropical relate to the tropics, two special parallels of latitude, or lines marking distance north or south of the Equator.

These descriptions distinguish patterns of heat and rainfall. Temperate hill areas, the dry Thar and the wet western coast therefore represent different climatic settings within the same country. The factors behind those settings work together, rather than each acting separately.

Why does latitude affect temperature?

Latitude measures distance north or south of the Equator, the reference line separating Earth’s northern and southern halves. Latitudes increase towards the poles. Places at low latitudes, nearer the Equator, are warmer, while those at high latitudes, nearer the poles, are colder.

The angle of sunlight explains this difference. Near the Equator, the Sun’s rays are nearly perpendicular, meaning that they strike almost straight onto the surface. Their energy is concentrated over a smaller area. Near the poles, the rays arrive obliquely, or at a slant.

What happens to sunlight near the poles?

Slanting rays spread their energy across a larger surface. They also pass through more of the atmosphere, the air surrounding Earth, which further disperses their energy. Consequently, the polar regions receive less heat than the region around the Equator.

The globe is shown within an atmospheric layer. Two bands of incoming solar radiation, meaning energy from the Sun, reach different parts of the globe. The rays concentrate near the Equator and spread over a wider area towards the pole.

See Fig. 3.4 in your NCERT textbook

Within India, Kanniyakumari and the Nicobar Islands are close to the Equator and remain warm or hot almost throughout the year. Srinagar, farther north, is much cooler. Latitude helps explain this contrast, although a region’s complete climate also depends on other factors.

How does altitude explain the Ooty and Coimbatore case study?

Altitude means height above sea level. Higher places are cooler than the plains below them. This helps explain why hill stations such as Munnar, Udhagamandalam, also called Ooty, Shimla and Darjeeling attract people seeking cooler conditions.

Atmospheric pressure is the pressure exerted by the weight of air above and around us. As altitude increases, atmospheric pressure and air density decrease. Air density describes how closely air is packed. In this simplified explanation, less dense air is cooler.

The Sun heats Earth’s surface, and air farther from that surface is less hot. Many Himalayan peaks are high enough to remain below water’s freezing point, the temperature at which water freezes. This keeps those peaks covered with snow.

What does the temperature comparison show?

Ooty and Coimbatore lie at almost the same latitude. Their summer temperatures nevertheless differ. In the following comparison, the symbol ° means degrees of temperature.

Their similar latitude makes altitude an important distinction in this case study. Ooty is a hill station, and higher altitude helps explain its lower temperatures. The comparison also shows why latitude alone cannot account for all climatic differences between places.

What does the Mumbai and Nagpur case study show about the sea?

Proximity to the sea means nearness to the sea. Water moderates coastal temperatures, making summers less hot and winters less cold. Moving inland, away from the coast, brings more extreme temperatures, with hotter summers and colder winters.

Land gains heat quickly and loses it rapidly. The sea gains and loses heat more slowly. Sea air therefore cools coastal regions in summer and warms them in winter. Coastal regions tend to have more moderate temperatures.

How do the figures compare?

Mumbai and Nagpur lie at a similar latitude. Mumbai is near the sea, whereas Nagpur is inland. Here °C means degrees Celsius, a unit of temperature. Temperature range means the difference between the maximum and minimum temperatures being compared.

Mumbai’s smaller range illustrates the sea’s moderating influence. Nagpur’s larger range illustrates the greater seasonal contrast inland. These temperatures are approximate and can vary from year to year.

The summer panel shows incoming heat and coastal cooling by sea air. The winter panel shows outgoing heat and coastal warming by sea air. Labels contrast the rapid heating and cooling of land with the slower changes in the sea.

See Fig. 3.6 in your NCERT textbook

How do winds, landforms and microclimates modify climate?

Wind is moving air. It carries warmer or cooler air between places. Punjab, Haryana, Rajasthan and Madhya Pradesh often receive winds from the west. After travelling across deserts from Arabia to Afghanistan, these winds bring dry, hot air that causes severe summer heat waves, periods of unusually hot weather.

In winter, cold winds from across the Himalayas enter the Himalayan foothills and cause cold waves, periods of unusually cold weather. Winds also affect humidity, the amount of water vapour in the air. Water vapour is water in its gaseous form.

Sea winds carry moisture inland, which may lead to rain. Precipitation means water falling from the sky, including rain, snow, sleet or hail. Sleet is frozen or partly frozen rain; hail consists of small, hard balls of ice.

What is the role of topography?

Topography means the physical surface features of an area, including mountains, valleys, slopes and coasts. The Himalayas and Karakoram protect the Indian subcontinent, to some extent, from cold winds originating in the deserts of Central Asia.

The nearly flat Thar Desert has no such protection from hot, dry winds. The Western Ghats also influence rainfall by acting as a barrier during the southwest monsoon. These examples show how landforms can alter the effects of moving air.

How can a small area have a different climate?

A microclimate is a local climate that differs from the surrounding region. Some enclosed valleys and forests have their own patterns of temperature, humidity and precipitation. Such differences can influence local plants, animals, crops and human well-being.

Urban heat islands are examples found in some cities. Numerous buildings and other concrete structures, together with little vegetation, trap heat. These cities are often much warmer than their surroundings. The local conditions modify the broader regional pattern.

Latitude, altitude, distance from the sea, winds and topography work collectively. Describing climate involves patterns of temperature, precipitation and wind over three decades or more. A decade means ten years, so the description requires a long record of conditions.

How do summer and winter monsoons develop?

Monsoon comes from the Arabic word mausim, meaning season. Strictly, it refers to seasonal winds across a large area of the Indian Ocean and surrounding regions, including South Asia, Africa and Australia. Common usage also applies the word to the seasonal rains.

The mechanism is complex, but a central relationship is straightforward: land heats and cools faster than the ocean. Changes in temperature produce differences in atmospheric pressure, and air moves from areas of high pressure towards areas of low pressure.

What is the summer sequence?

1. The Asian landmass heats as summer begins, producing a powerful low-pressure system, an area with lower air pressure.
2. The cooler ocean has higher pressure relative to the hot land.
3. Winds move from the ocean towards the land, carrying moisture with them.
4. The moisture condenses, meaning that water vapour changes into liquid water, and falls as heavy monsoon rain over the warmer land.

In India, these rains typically advance from the southern tip in early June. They move northwards over several weeks and cover the entire subcontinent by mid-July. Their progress is not smooth. The name southwest monsoon indicates the direction from which the winds arrive.

The Western Ghats act as a natural barrier. Their western slopes receive much rain, while the Deccan Plateau to the east receives less, often with interruptions. Thus, the same seasonal winds do not bring identical rainfall conditions everywhere.

The summer map labels Arabia and India. Red arrows curve from the sea towards India, and the winds are labelled southwest monsoon. Use the arrows to follow movement from ocean towards land.

See Fig. 3.9A in your NCERT textbook

Why does the wind direction reverse in winter?

In winter, land cools faster than the ocean. Higher pressure develops over land, while the warmer ocean has relatively lower pressure. Winds therefore blow from land towards the sea, bringing dry conditions to much of Asia.

The winter map labels Africa, Arabia and India. Red arrows point from the land towards the surrounding seas. The label northeast monsoon distinguishes this direction from the summer pattern.

See Fig. 3.9B in your NCERT textbook

The northeast monsoon brings dry winds and cold weather to south India. However, some winds cross the Bay of Bengal, collect moisture and bring rain to parts of eastern and southern India. Winter monsoon conditions are therefore not dry everywhere.

Mawsynram in Meghalaya receives about 11,000 millimetres of average annual rain, equivalent to 11 metres, and has the world’s highest average annual rainfall. Millimetres and metres measure length; rainfall depth describes how much rain is received.

How are culture and livelihoods connected with climate?

Seasonal rhythms influence agriculture, food, clothing and cultural traditions. India has many festivals associated with agricultural activities and seasons. Baisakhi and Onam are examples of festivals linked with farming and weather. Seasonal celebrations express the close connection between communities and their environment.

The monsoons have also inspired ragas, musical patterns used in Indian classical music. Meghamalhar and amruthavarshini are examples associated with the monsoon in Hindustani and Carnatic musical traditions. Rain is therefore significant in cultural life as well as farming.

How is traditional knowledge expressed?

On the Konkan coast, fishermen predict the monsoon’s onset when fish normally found underwater appear at the surface. In parts of southern India, the monsoon is said to arrive within 50 days after the Golden Shower tree, Cassia fistula, flowers.

Some communities believe that crows nesting high in trees indicate less rain, whereas lower nests suggest heavy rainfall is likely. These are examples of local traditional knowledge and beliefs. The words “is said to” and “believe” distinguish such traditions from guaranteed predictions.

What happens when monsoon rainfall is poor?

Monsoon failure means poor rain during the monsoon season. Agriculture suffers, while people, generally women, have to walk long distances for water. Agricultural labourers are likely to move to cities. These effects connect rainfall with both work and daily life.

Grains, vegetables and fruits become costlier, contributing to inflation, or a rise in prices. Industrial activity also often depends on predictable weather and available water. Climate therefore influences agriculture, labour, household needs and industry together.

The relationships become especially strained during climate-related disasters. Damage to crops or infrastructure, meaning supporting facilities such as roads and bridges, can disturb local economies. Understanding climate involves these human consequences as well as patterns of heat, rain and wind.

How can a low-pressure system develop into a cyclone?

A cyclone can form when an intense low-pressure system draws in air and wind speeds become high. Every year, India’s coastline, especially the eastern coast, experiences several cyclones. Some have caused severe losses of life, property and infrastructure.

What is the sequence of cyclone formation?

1. In some special situations, pressure near the sea becomes lower than pressure in surrounding areas.
2. Air moves from surrounding areas into this low-pressure system, also called a depression.
3. Air arriving from the sea brings moisture and rain. Winds gather moisture, clouds form, and the winds rotate inwards.
4. If the system is intense and winds are fast, a cyclone may result. The cloudless centre is called the eye of the cyclone.

Clouds consist of suspended water droplets, ice crystals or a mixture of both. They are not solid white objects. The cloudless eye is the centre towards which the surrounding winds rotate; it is a feature of the storm’s structure.

How are cyclones monitored and their effects addressed?

Cyclones can kill people and animals, damage buildings and other infrastructure, uproot trees and cause soil erosion, the removal of soil. Such losses affect both the natural environment and the activities on which communities depend.

The India Meteorological Department (IMD) tracks approaching cyclones and provides information about their formation, development and place of landing. Weather predictions can help local governments prepare resources and warn or evacuate coastal populations when necessary.

The National Disaster Response Force (NDRF) is specially trained for natural and human-made disasters. It has played a key role in rescue and evacuation during cyclones, floods, when water covers normally dry land, and landslides, sudden collapses of rock, soil or loose material. Monitoring and organised response have different, complementary functions.

Why do floods occur, and what does the Uttarakhand case study show?

A flood occurs when water spreads onto normally dry land. Heavy rain can create large amounts of run-off, water moving over land because it cannot be absorbed. Water may also accumulate in rivers or lakes until it overflows or breaks through their banks.

Flooding occurs frequently during the monsoons. Uttar Pradesh, Bihar, Kerala, Andhra Pradesh and Assam are particularly vulnerable. The effects include threats to people and animals, disruption of farming, and damage to the roads, bridges and buildings supporting economic life.

What is a glacial burst?

Glacial lakes are lakes associated with glaciers, large masses of ice, and their water often comes from melting glaciers. Rocks and ice can hold that water behind a barrier. Rapid melting or too much rain increases the water accumulating behind it.

Pressure may build until water breaks through the barrier. This is a glacial burst, which often has devastating effects on people and property. Glaciers melting too fast are increasingly contributing to the conditions described here.

Case study: What happened in Uttarakhand in 2013?

Continuous heavy rain over several days caused a sudden glacial burst in Uttarakhand. Many landslides followed. Areas around Kedarnath temple were completely destroyed, and floods washed away several villages, roads and bridges.

About 6,000 people lost their lives, many of them pilgrims. The example connects heavy rainfall, a glacial burst, landslides and flooding. Its consequences extended from loss of life to the destruction of settlements and transport connections.

Why do cities also flood?

Heavy rain can overwhelm urban drainage. Poorly planned construction may encroach on waterways and obstruct the flow of water. Concrete and asphalt surfaces also prevent water from being absorbed into the earth. These conditions help explain why cities experience flooding during heavy rain.

Photographs: Cyclone, Landslide, Forest Fire and Flood (NCERT Class 7 Figure 3.15). Four photographs are labelled Cyclone, Landslide, Forest Fire and Flood. They show fallen trees, slope material across a road, flames among vegetation near buildings, and water surrounding a partly submerged building.

What causes landslides and forest fires?

A landslide is a sudden collapse of rock, soil or debris, meaning loose material. Heavy rain, earthquakes or volcanic activity often trigger landslides. They are common in mountainous and hilly regions and often occur during the monsoon.

Examples of affected regions include Himachal Pradesh, Uttarakhand, Sikkim, Arunachal Pradesh and the Western Ghats. The combination of hills and heavy rain is important, but human actions can increase the chances of a landslide as well.

Which human activities increase landslide risk?

Cutting down forests has increased the chances of landslides in these regions. So has building infrastructure without following approved methods. Too many buildings that block the natural movement of water add another problem. The danger involves both natural processes and changes made by people.

Why do forest fires spread?

Forest fires are uncontrolled fires that spread rapidly through vegetation. Dry climatic conditions, droughts, meaning periods of serious water shortage, or strong winds often fuel them. Human carelessness is another frequent cause.

Such fires are common in states with extensive forests or grasslands, including Uttarakhand, Himachal Pradesh, Madhya Pradesh and Chhattisgarh. They also occur in mountain ranges such as the Western Ghats. A fire’s effects extend beyond the vegetation it burns.

Forest fires harm wildlife, damage the ecosystem, the system of living things and their surroundings, and worsen air quality. They can also displace local communities. The consequences are therefore environmental and economic, affecting habitats as well as people’s homes and activities.

Distinguishing causes from effects helps explain each disaster. Dry conditions and carelessness are causes of forest fires; damaged forests and displaced communities are consequences. For landslides, heavy rain and obstructed water movement are causes, while collapsed rock and soil create destructive effects.

What is climate change, and how can people respond?

Climate change means significant, long-term changes in climate at a regional or planetary scale. It includes changes in temperature, precipitation and weather events. Natural processes drove changes over past millennia, meaning periods of thousands of years, and even over millions of years.

Since the nineteenth century, however, climate change has been largely driven by human activities. These include burning fossil fuels, deforestation, or clearing forests, environmentally harmful industrial practices, and production and consumption that are excessive or wasteful.

How do greenhouse gases affect temperature?

Fossil fuels include coal, petroleum oil and natural gas. They formed from the remains of plants and animals buried millions of years ago. Heat and pressure gradually transformed these remains beneath layers of soil and rock or under the sea.

Carbon dioxide, written as CO₂, and other gases trap heat from the Sun. This natural greenhouse effect warms Earth enough to support life. The gases responsible are called greenhouse gases. Carbon dioxide and other gases are naturally released gradually into the atmosphere.

Industry, transport and agriculture have released enormous amounts of greenhouse gases in just a few centuries. The increase traps extra heat, causing rapid global warming, or warming of the planet, and disrupting climate patterns to which living things and societies have adapted.

Early in 2025, India’s average temperature was 1 to 3°C above normal. Winter was much shorter and milder than usual. Such changes affect agriculture and many small-scale industries, illustrating how rising temperatures create practical challenges.

What do resilience, adaptation and mitigation mean?

Resilience is the capacity to withstand difficulties or recover quickly. Adaptation means adjusting to changed conditions. Understanding the relationships between climate change and disasters helps communities prepare, develop resilience and adapt.

Mitigation means taking steps to slow global warming and reduce the causes of climate change. Measures include reducing greenhouse gas emissions, planting trees, expanding renewable energy and improving energy efficiency. Emissions are releases of gases; energy efficiency means using energy with less waste.

Renewable energy comes from sources that can be replenished. Governments also attempt to promote sustainable lifestyles, meaning ways of living that can be maintained over a long period. These measures often clash with desires for economic growth and greater consumption.

Responses therefore involve both reducing causes and preparing for consequences. Climate knowledge connects long-term changes with decisions about water, agriculture, energy and communities. It also helps explain why extreme weather or temperatures can have severe effects on natural and human life.

Glossary

• Weather — The conditions experienced from hour to hour or day to day, such as wind, rain, heat or dryness.
• Climate — The long-term pattern of weather in a region, extending over several decades at least.
• Latitude — A measure of distance north or south of the Equator, increasing towards the poles.
• Altitude — The height of a place above sea level, helping explain differences between hills and plains.
• Topography — The physical surface features of an area, including mountains, valleys, slopes, hills and coasts.
• Microclimate — A climate within a small geographical area that differs from the climate of the surrounding region.
• Monsoon — Seasonal winds over the Indian Ocean and surrounding regions; the word also commonly refers to seasonal rains.
• Temperature range — The difference between the maximum and minimum temperatures used in a particular comparison.
• Glacial burst — The breaking of a glacial lake’s containing barrier when accumulated water builds up sufficient pressure.
• Climate change — Significant long-term changes in temperature, precipitation and weather events at regional or planetary scales.
• Resilience — The capacity of people or communities to withstand difficulties or recover quickly from them.
• Mitigation — Steps taken to slow global warming and reduce the causes responsible for climate change.

Common errors and misconceptions

• Misconception: One rainy day proves that a place has a wet climate. Correct: It describes weather. Climate concerns patterns over several decades, including recurring seasonal conditions.
• Misconception: Places at almost the same latitude must have the same temperatures. Correct: Altitude and distance from the sea also matter, as the Ooty-Coimbatore and Mumbai-Nagpur comparisons show.
• Misconception: The Himalayas completely prevent cold winds from reaching India. Correct: The Himalayas and Karakoram protect the subcontinent to some extent. Cold winds can enter the Himalayan foothills.
• Misconception: Monsoon means rain and nothing else. Correct: Its precise meaning is seasonal winds. These winds carry moisture and help produce the rains commonly called the monsoon.
• Misconception: The northeast monsoon is dry everywhere. Correct: Some winds collect moisture over the Bay of Bengal and bring rain to parts of eastern and southern India.
• Misconception: All greenhouse warming is harmful. Correct: The natural greenhouse effect supports life. The rapid increase in greenhouse gases caused by human activities traps extra heat and disrupts climate patterns.

Exam-style questions with model answers

Q1. A rainy day describes immediate conditions, while climate describes regional weather patterns over several decades. Using these descriptions, distinguish weather from climate in two points. [2 marks]

1. Weather concerns conditions experienced over short periods, such as the rain on a particular day.
2. Climate concerns a region’s long-term weather pattern, established across several decades rather than a single day.

Q2. Ooty and Coimbatore have almost the same latitude. Ooty is a higher hill station, with summer temperatures of 10 to 25°, compared with Coimbatore’s 25 to 38°; ° means degrees of temperature. What does this comparison show about latitude and altitude? Give two points. [2 marks]

1. Similar latitude does not produce identical temperatures: Ooty’s summer temperatures are lower than Coimbatore’s in the given comparison.
2. Ooty’s higher altitude helps explain this difference, because temperature decreases as altitude increases.

Q3. Mumbai, near the sea, has summer temperatures around 32°C and winter temperatures around 18°C. Inland Nagpur has summer temperatures up to 44°C and winter temperatures about 10°C. Here °C means degrees Celsius; temperature range means maximum minus minimum temperature. Calculate both ranges and compare them. [3 marks]

1. Mumbai’s temperature range is about 14°C, found by subtracting the winter value of 18°C from the summer value of 32°C.
2. Nagpur’s temperature range reaches 34°C, found by subtracting the winter value of 10°C from the summer value of 44°C.
3. Mumbai has the smaller range. The supplied figures show less seasonal temperature contrast near the sea than at inland Nagpur.

Q4. Land heats faster than the ocean in summer. Heated Asian land develops low air pressure; the cooler ocean has relatively high pressure. Air moves from high to low pressure, and sea winds carry moisture that condenses into liquid water and falls as rain. Explain summer monsoon formation in four stages. [4 marks]

1. The Asian landmass heats faster than the ocean as summer begins, producing a strong area of low atmospheric pressure over land.
2. The cooler ocean has relatively high atmospheric pressure compared with the warmer landmass, creating a pressure difference between them.
3. Air moves from the high-pressure ocean towards the low-pressure land, so the incoming winds carry ocean moisture inland.
4. The moisture condenses into liquid water and falls over the warmer land as heavy monsoon rain, completing the given sequence.

Q5. Poor monsoon rainfall harms agriculture. People, generally women, walk farther for water; agricultural labourers are likely to migrate to cities; grains, vegetables and fruits become costlier. Industry often depends on available water and predictable weather. Explain five effects of poor monsoon rainfall from this information. [5 marks]

1. Agriculture suffers because rainfall during the monsoon season is poor. The problem therefore directly affects an activity closely connected with seasonal rain.
2. Obtaining water becomes harder, as people must walk longer distances to find it. The supplied information identifies women as generally undertaking this work.
3. Agricultural labourers are likely to migrate to cities. This connects conditions in agriculture with movement of workers, without claiming that every labourer migrates.
4. Grains, vegetables and fruits become more expensive. Rising food prices contribute to inflation and show how rainfall can affect the cost of everyday needs.
5. Industrial activity can also be affected because it often relies on available water and predictable weather. The consequences therefore extend beyond farming alone.

Q6. In Uttarakhand in 2013, continuous heavy rain over several days caused a sudden glacial burst, meaning water broke through a glacial lake’s barrier. Many landslides followed; areas around Kedarnath temple were destroyed, villages, roads and bridges were washed away, and about 6,000 people died, many of them pilgrims. Explain the trigger and two kinds of consequences. [3 marks]

1. The trigger was continuous heavy rain over several days, which caused a sudden glacial burst. Many landslides followed this release of water.
2. Settlements and infrastructure suffered severe damage: areas around Kedarnath temple were destroyed, and floods washed away villages, roads and bridges.
3. The disaster also caused major loss of life. About 6,000 people died, and many of those who lost their lives were pilgrims.

Q7. In summer the sea gains heat slowly while land heats rapidly; in winter the sea loses heat slowly while land cools rapidly. Sea air cools coastal areas in summer and warms them in winter. Explain the two seasonal effects on coastal temperatures. [2 marks]

1. Summer temperatures near the coast are moderated because sea air cools the coastal region while the land heats rapidly.
2. Winter temperatures are moderated because sea air warms the coastal region while the land loses heat rapidly.

Q8. The natural greenhouse effect traps enough heat to support life. Human activities have rapidly increased greenhouse gases, trapping extra heat and disrupting climate patterns. Governments attempt to reduce emissions, plant trees, expand renewable energy and improve energy efficiency. These mitigation steps aim to slow global warming and reduce its causes. Using these facts, explain the natural effect, the added problem and three responses. [5 marks]

1. The natural greenhouse effect retains heat and warms Earth enough to support life. It therefore helps create the conditions that allow living things to survive.
2. The rapid human-caused increase in greenhouse gases traps extra heat. It causes global warming and disrupts climate patterns, making the added increase the problem described.
3. Reducing emissions means limiting releases of greenhouse gases. It is a mitigation response because it addresses a cause of the extra heat being trapped.
4. Planting trees is another measure that governments attempt to promote as part of climate mitigation. It belongs among responses intended to reduce climate-change causes.
5. Expanding renewable energy and improving energy efficiency are further responses. Together, they form part of the stated measures intended to slow global warming.

Key takeaways

• Weather changes over hours or days, seasons recur each year, and climate describes regional patterns across several decades.
• India’s climatic diversity includes alpine mountains, temperate hills, subtropical plains, arid desert and tropical coastal or peninsular regions.
• Latitude, altitude, proximity to the sea, winds and topography collectively determine a region’s climate.
• Land heats and cools faster than the ocean, helping create the pressure differences responsible for seasonal monsoon winds.
• The southwest monsoon brings summer rain, while some northeast monsoon winds bring rain after crossing the Bay of Bengal.
• Climate influences crops, festivals, water collection, migration, food prices and industrial activity, connecting the environment with livelihoods.
• Cyclones, floods, landslides and forest fires damage lives and economies; human activities can increase some disaster risks.
• Rapid increases in greenhouse gases trap extra heat; mitigation addresses causes, while resilience helps communities withstand or recover from difficulties.

Test yourself

Why is a description of one rainy afternoon insufficient to describe climate?

It describes short-term weather. Climate requires a long-term regional pattern extending over several decades at least.

What does the sea do to coastal summer and winter temperatures?

It moderates them, making summers less hot and winters less cold through its slower heating and cooling.

Why do the western slopes of the Western Ghats receive much monsoon rain?

The Western Ghats act as a barrier to southwest monsoon winds; the Deccan Plateau to their east receives less rain.

What is an urban heat island?

It is a city microclimate where numerous buildings, concrete structures and little vegetation trap heat, often making it much warmer than surrounding areas.

How can northeast monsoon winds bring rainfall?

Some cross the Bay of Bengal, gather moisture and bring rain to parts of eastern and southern India.

What is meant by the eye of a cyclone?

It is the cloudless centre of the depression towards which surrounding winds rotate inwards.

How can construction make urban flooding worse?

Poorly planned construction can block waterways, while concrete and asphalt prevent the ground from absorbing rainwater.

How does mitigation differ from resilience?

Mitigation aims to slow global warming and reduce climate-change causes. Resilience is the capacity to withstand difficulties or recover quickly.