Study of Continents: North America and South America | ICSE Class 6 Geography Notes

This note covers the formation of continents; the locations, boundaries, countries, capitals and major physical features of North America and South America; map work; lumbering in Canada; and life in the Amazon river basin.

How did the continents reach their present positions?

A continent is a large continuous expanse of land. An ocean is one of the largest bodies of water on Earth. North America and South America are generally considered separate continents, although they can also be considered one landmass called America.

The most widely used arrangement recognises seven continents: Asia, Africa, North America, South America, Antarctica, Europe and Australia. This is a way of grouping the land, rather than a claim that every continent is completely separated from every other continent by water.

What is continental drift?

Continental drift means the movement of continents over geological time, the very long periods during which Earth changes. Alfred Wegener proposed that the continents had once formed a single large landmass, or supercontinent, called Pangaea, meaning “all earth”.

In his explanation, Pangaea began to split around 200 million years ago. It first separated into a northern part, Laurasia, and a southern part, Gondwanaland. These subsequently broke into smaller landmasses. The facing coastlines of South America and Africa provide evidence of an earlier connection.

How do moving plates help explain this?

The lithosphere, Earth's rigid outer layer, is divided into large and small slabs called tectonic plates. These plates carry continents and ocean floor. Their slow movement changes the arrangement of land and water over very long periods.

A plate and a continent are therefore different things. A plate can include both continental land and ocean floor. Present maps show the continents in their present positions; they do not show an arrangement that has remained unchanged throughout Earth's history.

For the Americas, keep the sequence clear: an earlier connected landmass, its division into smaller masses, and continuing movement. This broad explanation concerns changing continental positions, rather than the sudden appearance of fully formed modern countries.

Where is North America, and what surrounds it?

North America lies north of the Equator and mainly in the Western Hemisphere. The Equator is the imaginary circle halfway between the North and South Poles. A hemisphere is half the Earth; the Equator separates the Northern and Southern Hemispheres.

The Western Hemisphere is the half of Earth west of the Prime Meridian, the reference line for measuring east and west positions, up to the opposite meridian. A meridian is an imaginary semicircle joining the poles.

Which water bodies form its boundaries?

The Arctic Ocean lies to the north, the Atlantic Ocean to the east and the Pacific Ocean to the west. Towards the south are the Gulf of Mexico, the Caribbean Sea and the land connection leading to South America.

A gulf is a part of a sea or ocean extending into the land. A strait is a narrow passage of water connecting larger water bodies. The Bering Strait separates northwestern North America from northeastern Asia.

The Isthmus of Panama links North America and South America. An isthmus is a narrow strip of land joining larger land areas. It is therefore a land connection, while a strait is a water passage.

The rank describes area, meaning the amount of surface covered. It does not rank population or wealth. North America includes the Central American countries and the Caribbean island countries, as well as Canada, the United States of America and Mexico.

The world map labels North America above South America, with the Atlantic Ocean to their east and the Pacific Ocean to their west. The Arctic Ocean is labelled above North America. The map is not to scale.

See Fig. 2.3 in your NCERT textbook

Which countries and capitals should be located in North America?

A country is a political unit with its own government and territory. A capital is the city that serves as its centre of government. A political map shows countries, boundaries and important settlements, rather than concentrating on the shape and height of the land.

Learn the country and its capital as a pair, then locate both. A country's name labels an area; a capital's name labels a particular place within that area. The name of a large or familiar city is not automatically the capital.

Which countries lie on the mainland?

In Washington, D.C., the letters D.C. stand for District of Columbia. Canada lies north of the main continuous part of the United States, and Mexico lies to its south. Central America continues southeastwards towards Panama and the connection with South America.

Which independent countries are in the Caribbean region?

An island is a landmass, smaller than a continent, surrounded by water. The Caribbean region contains island countries as well as territories belonging to other countries. The following table lists its independent countries, including the Bahamas in the wider Caribbean region.

Greenland, the world's largest island, belongs geographically to North America. It is a self-governing part of the Kingdom of Denmark, rather than an independent country. Its position illustrates why a geographical grouping and a political relationship need not be the same.

What are North America's major physical features?

A physical map shows natural features such as mountains, plains, plateaus, rivers and lakes. Relief means the differences in the height and shape of the land. To organise North America's relief, work from the western mountains towards the central lowlands and the eastern uplands.

What lies in the west and centre?

The Western Cordilleras form a broad western belt of mountain ranges and associated highlands. A mountain range is a connected series of mountains. The Rocky Mountains are a major range in this belt. The Rockies are not a name for every western mountain range.

The Central Lowlands extend across much of the interior. A plain is a broad area of relatively level land. The Great Plains lie east of the Rocky Mountains. The Prairies are the temperate grasslands of North America, with extensive grass cover in their natural state.

Temperate refers to the regions between the tropical and polar zones. Tropical refers to the belt around the Equator between the tropics; polar refers to the regions around the poles. The tropics are the two latitude circles bounding the tropical belt. Grassland, plain and lowland describe different aspects of a place: plant cover, surface shape and relative height. They should not be treated as interchangeable names for exactly the same area.

What lies in the north and east?

The Canadian Shield is an extensive area of ancient exposed rock around Hudson Bay. A shield is an old, stable part of a continent where ancient rocks occur at or near the surface. The Appalachian Mountains lie in eastern North America.

A river system consists of a main river and the streams or rivers that join it. These joining rivers are called tributaries. The Mississippi and its tributary, the Missouri, form an important river system in the central part of the continent, draining towards the Gulf of Mexico.

The Great Lakes are Superior, Michigan, Huron, Erie and Ontario. A lake is a body of water surrounded by land. The St Lawrence River provides an outlet from the Great Lakes system towards the Atlantic Ocean.

On an outline map, label the Rocky Mountains in the west, the Great Plains to their east, the Canadian Shield around Hudson Bay and the Appalachians in the east. Add the Mississippi, the Great Lakes and the surrounding oceans.

Use different map symbols for different features. Label a river along its course, a mountain range along its belt and a lake beside its water area. A map key explains what the chosen symbols and colours mean.

Case study: How does lumbering in Canada connect forests and work?

Lumbering is the cutting and preparation of trees for use as timber. Timber is wood used for purposes such as construction and manufacturing. Canada's extensive forests provide a resource for forest industries, linking the natural environment with employment and useful products.

Why are forests important to this activity?

Canada has extensive coniferous forests, forests containing cone-bearing trees, many with needle-like leaves. Spruce, pine and fir are important examples. Their wood belongs to the commercial category called softwood, meaning wood from conifers; the name does not guarantee that every piece is physically soft.

Pulp is a mass of separated wood fibres, the thin strands within wood, used to make paper and related products. A sawmill is a factory where logs, cut lengths of tree trunks, are sawn into usable lengths and shapes. Forests thus supply material for both timber products and the pulp and paper industry.

The connection is geographical: trees provide raw material, while transport links the forest with mills and markets. A raw material is a basic material used to make a product. A market is where products are bought and sold.

What happens between a standing tree and a finished product?

1. Selected trees are felled, meaning cut down, in the forest.
2. Branches are removed, and trunks are cut into logs suitable for handling and transport.
3. The logs are collected and transported from the forest to processing facilities.
4. At sawmills, logs are cut into timber; wood intended for pulp is processed for paper and related uses.

These are broad stages, not a rule that every Canadian operation uses identical equipment or timing. Modern operations use machinery and road transport. The familiar account of logs being floated along rivers describes a historical practice, not every present-day operation.

Why does forest management matter?

Forest management means planning how forests are used and maintained. Forests are more than a store of wood: they also provide living space for plants and animals. A habitat is the place where an organism lives.

Regeneration, meaning the growth of a new forest after loss or harvesting, may occur naturally or through planting. Responsible use therefore involves considering future tree growth and habitats alongside the immediate supply of wood. Cutting trees and replacing forest cover are connected responsibilities.

This case study concerns a particular forest-based industry. It does not mean that all Canadians work as lumberers, or that forests are the country's only economic resource. Link the occupation to the places and resources that support it.

Where is South America, and what are its boundaries?

South America lies in the Western Hemisphere. The Equator crosses its northern part, so most of the continent lies in the Southern Hemisphere, with a smaller part in the Northern Hemisphere. This differs from North America, which lies north of the Equator.

The Pacific Ocean borders its western side and the Atlantic Ocean its eastern side. The Caribbean Sea lies along part of the northern coast. The Isthmus of Panama connects the continent with North America to the northwest.

How do latitude and the Equator help locate places?

Latitude is the angular distance north or south of the Equator. The symbol ° means degrees, a unit for measuring angles; N means north and S means south. Thus 10°N means ten degrees north of the Equator.

The equatorial region is the region close to the Equator. In this study of the Amazon, it is described between 10°N and 10°S. These are reference latitudes for the equatorial region, not the full northern and southern limits of South America or the Amazon drainage basin.

South America stretches well beyond this equatorial belt. Do not use the hot, wet conditions of the Amazon to describe the whole continent. First locate the continent, then locate the particular region within it; the two scales of description answer different questions.

Which countries and capitals should be located in South America?

South America's political divisions should be studied alongside its physical features. A country boundary divides political territories; a river or mountain range is a natural feature. Rivers and highlands can extend across more than one country, so a physical region need not fit inside a political boundary.

What are the independent countries and their capitals?

Bolivia requires care: Sucre is its constitutional capital, while La Paz is its seat of government, where the principal executive institutions operate. Keeping both roles in the answer avoids treating the two city names as interchangeable.

French Guiana is part of France rather than an independent South American country. It should not be added to the table as though it had the same political status as Brazil or Peru. Guyana and French Guiana are different places.

How can the countries be grouped for map practice?

Begin with Brazil in the large eastern part and Chile along the western side. Locate Argentina towards the south, then work northwards and inland to the remaining countries. Use the country boundaries to place capital symbols, rather than placing every capital in the centre of its country.

Connect this political work to the Amazon case study. The Amazon basin includes parts of several countries, including Brazil and Peru. Learning the countries makes it easier to understand why the basin is a shared geographical region rather than another name for Brazil.

What are South America's major physical features?

South America's main physical features include the Andes in the west, broad river lowlands and eastern highlands. A highland is an extensive area of high land. A plateau is an elevated area with a relatively level surface.

Where are the mountains and highlands?

The Andes extend along the western side of South America. They form a long mountain barrier near the Pacific coast. The Guiana Highlands lie towards the north, while the Brazilian Highlands occupy a large part of eastern South America.

The Patagonian Plateau lies in the southern part of the continent, mainly in Argentina. These features should be distinguished from the low-lying Amazon basin. High land, river valleys and plains form a varied surface, rather than one continuous rainforest plain.

Which rivers and plains are important?

A river basin is the area drained by a main river and its tributaries. To drain an area means to carry its water away through streams and rivers. The Amazon basin is the world's largest river basin.

The Amazon flows from the mountains in the west towards the Atlantic Ocean in the east. A river's mouth is where it enters another body of water. Numerous tributaries bring water from different parts of the basin into the main river.

The Orinoco drains part of northern South America. Farther south, the Paraná, Paraguay and Uruguay rivers belong to the La Plata drainage system. The Pampas are temperate grasslands, especially associated with Argentina and Uruguay.

The Atacama Desert lies on the western side, mainly in northern Chile. A desert is a very dry region with little rainfall and sparse vegetation. Its presence is another reason not to describe all South America as hot, wet rainforest.

The map places the Amazon basin in the northern part of South America. Blue river lines join the Amazon across the shaded basin, and the Equator crosses the northern part of the continent. Country boundaries show that the basin extends across several countries.

See Fig. 6.2 in your NCERT textbook

For physical map practice, mark the Andes as a long belt, the highlands as regions and rivers as lines following their courses. Add the Amazon's Atlantic outlet. This combination explains the arrangement of land and water more clearly than isolated labels.

Case study: How does the Amazon environment shape people's lives?

The Amazon basin shows connections between climate, forests, rivers and daily life. Climate means the usual weather conditions of a place over a long period. Humidity is the amount of water vapour in the air. The basin has a hot, wet climate throughout the year.

What are the climate and rainforest like?

Days and nights are almost equally hot and humid. It rains almost every day. At night the temperature falls, but humidity remains high. These descriptions do not mean that temperatures remain exactly the same or that rain falls continuously without a break.

Heavy rainfall supports thick rainforest, dense forest growing under conditions of abundant rainfall. Its canopy, the roof formed by leaves and branches, keeps the ground dark and damp. Only shade-tolerant vegetation may grow beneath this dense cover.

Flora means the plant life of a region, while fauna means its animal life. Toucans, hummingbirds, macaws, monkeys and sloths are examples of Amazon fauna. The rivers contain many kinds of fish, including piranhas. The basin supports an extraordinary variety of life.

How do forest communities obtain food and shelter?

People grow most of their food on small areas cleared in the forest. Manioc, also called cassava, is a root crop and a staple food, meaning a main food eaten regularly. It is the source of tapioca, a starchy food product. Pineapple and sweet potato are also grown. Hunting and fishing also contribute to food supplies.

Cash crops are crops grown for sale. Coffee, maize and cocoa are examples grown in the region. Food farming, fishing, hunting and the sale of crops connect people with different resources, rather than making them dependent on a single activity.

The forest supplies wood for housing. Some families live in thatched houses shaped like beehives; thatch is a roof covering made from plant material. Other large, apartment-like houses are called malocas and have steeply sloping roofs. These examples do not describe every home in the basin.

How does slash-and-burn cultivation work?

Slash-and-burn cultivation involves clearing vegetation, burning it and growing crops on the cleared patch. Burning releases nutrients into the soil. Nutrients are substances that living things need for growth; soil nutrients support plant growth. Soil fertility is the soil's ability to support plant growth.

1. Trees and bushes are cut on a patch of land.
2. The cut vegetation is burnt, releasing nutrients into the soil.
3. Crops are grown on the cleared patch for a few years.
4. Repeated use reduces soil nutrients, so cultivation moves to another patch.
5. Young trees grow on the old patch, and soil fertility is restored before people return to cultivate it again.

The recovery stage matters: the account includes regrowth on the old field, rather than permanent cultivation of the same cleared patch without a pause.

How is life changing?

Life in the Amazon basin is slowly changing. Rivers have long provided routes into forest areas; roads and aircraft also provide access. Development has displaced Indigenous people, meaning communities with longstanding ancestral connections to the region, and has contributed to forest loss.

Deforestation is the removal of forest cover. After forest clearance, rain can wash away topsoil, the upper layer of soil. Protecting forests therefore concerns soil, wildlife and people's lives together, rather than the preservation of trees alone.

How can the two continents and their case studies be compared?

A useful comparison uses the same feature on both sides. Compare location with location, relief with relief, and an occupation with an occupation. Avoid comparing the whole of Canada with one house type in the Amazon, because those descriptions concern different things.

What broad similarities and differences stand out?

Both continents have major mountains towards the west and face the Atlantic to the east and the Pacific to the west. However, the countries, river systems and named landforms differ. Similar arrangements do not make the continents identical.

What do the case studies teach about people and places?

Canadian lumbering focuses on the use of forest wood for timber and pulp. The Amazon study includes food growing, fishing, forest materials and housing. In both, natural resources, useful materials obtained from nature, help shape people's work and daily needs.

The Canadian example includes coniferous forests, while the Amazon example concerns hot, wet rainforest. Transport matters in both cases because people need to move materials or reach settlements. Forest protection also matters in both, though the activities and environmental conditions differ.

Use each example carefully. Neither case study represents every person's life across its whole continent. Geography helps explain the opportunities and difficulties of a place; it does not mean that everyone living there has the same job, home or way of life.

For revision, use a world map for continental position, political maps for country-capital pairs and physical maps for landforms and rivers. Then explain one connection between an environmental feature and a human activity, such as forest wood supporting Canada's timber industry.

Glossary

• Continent — A large continuous expanse of land, such as North America or South America.
• Continental drift — The movement of continents over the very long periods of Earth's geological history.
• Tectonic plate — A rigid slab of Earth's outer layer carrying continental land, ocean floor or both.
• Hemisphere — One half of the Earth, identified using reference lines such as the Equator.
• Latitude — The angular distance of a place north or south of the Equator, measured in degrees.
• Isthmus — A narrow strip of land connecting larger land areas, such as the Isthmus of Panama.
• Strait — A narrow passage of water that connects two larger bodies of water.
• Relief — The differences in the height and shape of the land across an area.
• Tributary — A stream or river that joins a larger river and contributes water to it.
• River basin — The area drained by a main river together with all of its tributaries.
• Lumbering — The cutting and preparation of forest trees for use as timber and wood products.
• Coniferous forest — A forest containing cone-bearing trees, many of which have needle-like leaves.
• Canopy — The roof of leaves and branches formed by trees in a forest.
• Slash-and-burn cultivation — Farming in which vegetation is cut and burnt before crops are grown on the cleared patch.
• Deforestation — The removal of forest cover, affecting the soil, habitats and people associated with it.

Common errors and misconceptions

• Misconception: A continent and a country are the same. Correct: A continent is a large landmass; a country is a political unit. Brazil is a country within South America.
• Misconception: South America is entirely south of the Equator. Correct: Most of it lies south of the Equator, but its northern part extends into the Northern Hemisphere.
• Misconception: An isthmus is a water passage. Correct: An isthmus is a land connection; a strait is a narrow passage of water.
• Misconception: Canada's capital is any of its largest cities. Correct: Canada's capital is Ottawa. Capital status concerns government, rather than a city's size.
• Misconception: The Amazon basin is entirely in Brazil. Correct: It crosses national boundaries and includes parts of several South American countries.
• Misconception: Every Canadian lumbering operation floats logs down rivers. Correct: River floating is a historical practice; modern operations also use machinery and road transport.
• Misconception: All South America has the Amazon's climate. Correct: The Amazon is one region; the continent also contains highlands, temperate grasslands and the dry Atacama Desert.
• Misconception: Rain falls without interruption in the Amazon. Correct: Rain falls almost every day, which is different from continuous rainfall without any break.

Exam-style questions with model answers

Q1. Panama is a narrow strip of land joining the two Americas. The Bering Strait is a narrow water passage between North America and Asia. Classify each feature as an isthmus or a strait and explain your choice. [2 marks]

1. Panama is an isthmus because it is a narrow land connection joining two larger land areas.
2. The Bering Strait is a strait because it is a narrow passage of water, rather than a land connection.

Q2. A map shows North America north of the Equator, most of South America south of it, and the Pacific west of both continents. State three location conclusions from these observations. [3 marks]

1. North America is in the Northern Hemisphere because the Northern Hemisphere is the half of Earth lying north of the Equator.
2. South America is mainly in the Southern Hemisphere. The wording “most” does not place the whole continent south of the Equator.
3. The Pacific Ocean lies on the western side of both continents, so they share this broad relationship with the same ocean.

Q3. Use these pairs: Canada: Ottawa; Mexico: Mexico City; Brazil: Brasília; Peru: Lima. Canada and Mexico are in North America; Brazil and Peru are in South America. Give four correctly grouped country-capital statements. [4 marks]

1. Canada belongs in the North American group, and Ottawa is the capital to place beside its country name.
2. Mexico also belongs in North America; its capital is Mexico City, so the full city name should be retained.
3. Brazil belongs in the South American group, and Brasília is the capital associated with that country in the supplied list.
4. Peru is the other South American country in this list, and Lima is the capital to match with it.

Q4. Canadian forests supply logs. Logs are cut into timber at sawmills, wood fibres make pulp for paper, roads carry logs to mills, and forest regrowth replaces harvested trees. Explain five links between resources, work and future supply using these facts. [5 marks]

1. The forest is the source of raw material. Its trees provide the logs that allow the wood-processing activities in the question to take place.
2. Sawmills turn logs into usable timber. This connects the natural forest resource with manufacturing work and with wood products people can use.
3. Wood fibres provide material for pulp used in paper making. The same broad forest resource therefore supports more than the production of timber.
4. Road transport connects the place where trees are harvested with the mills where logs are processed, making movement between the stages possible.
5. Forest regrowth replaces harvested trees and supports future supplies. Continued use of the resource therefore needs attention to replacement as well as cutting.

Q5. In the Amazon basin, rain falls almost every day, nights remain humid, a dense canopy shades the ground, rivers provide fish and routes, and forests provide house-building wood. Explain five ways these conditions influence the environment or daily life. [5 marks]

1. Frequent rainfall supplies moisture for plant growth, helping thick rainforest develop in the basin.
2. High humidity makes people's skin feel sticky. Since humidity remains high at night, this effect can persist even when the temperature falls.
3. The dense canopy reduces the sunlight reaching the forest floor. Plants growing beneath it need to tolerate the shaded conditions created by that cover.
4. Rivers support daily life in two connected ways: they provide fish for food and serve as routes through parts of the basin.
5. Forest wood provides material for building houses. Housing is therefore one example of people using a locally available natural resource to meet their needs.

Q6. In slash-and-burn cultivation, trees and bushes are cut, burning the vegetation releases soil nutrients, crops use the cleared patch for a few years, and repeated use reduces nutrients. Cultivation then moves to another patch while regrowth restores fertility on the old one. Explain these four stages in order. [4 marks]

1. First, trees and bushes are cut to clear a patch. This prepares the space that will be used for cultivation.
2. Next, the cut vegetation is burnt. Burning releases nutrients into the soil before crops are grown on the cleared land.
3. Crops are then grown on the patch. Repeated use reduces the soil nutrients that help support their growth.
4. Finally, cultivation moves to another patch while the old one is left for regrowth and the recovery of soil fertility.

Q7. The Amazon flows from western mountains to the Atlantic in the east. Smaller rivers join it, and together they drain land in several countries. Explain its flow direction, tributaries and basin in three points. [3 marks]

1. The Amazon flows eastwards from the western mountains towards the Atlantic Ocean, which receives the river's water at its mouth.
2. The smaller joining rivers are tributaries. They add water to the main Amazon river from different parts of the surrounding land.
3. The drained area is the river basin. Because it covers parts of several countries, it cannot be identified with one country's territory alone.

Q8. Sucre is Bolivia's constitutional capital, while La Paz is its seat of government. State the separate role of each city. [2 marks]

1. Sucre has the role of constitutional capital of Bolivia, as specified in the information given.
2. La Paz has the role of seat of government; this is a different description from constitutional capital.

Key takeaways

• Continents occupy changing positions over geological time; moving tectonic plates carry both continental land and ocean floor.
• North America lies north of the Equator, while South America lies mostly south of it.
• The Atlantic lies east of both continents and the Pacific west; Panama provides their narrow land connection.
• Learn countries and capitals as pairs, keeping political boundaries separate from physical regions such as river basins.
• The Rockies and Andes are major western mountain features; the Mississippi and Amazon are important river systems.
• Canadian lumbering connects forests with transport, sawmills, timber and pulp, while forest regrowth supports future supplies.
• The Amazon's hot, wet environment supports rainforest and influences food growing, fishing, transport and house-building materials.
• Forest loss affects habitats, soil and people; case studies explain regional connections without representing everyone's life.

Test yourself

What is the difference between a country and a continent?

A country is a political unit with its own government and territory; a continent is a large continuous landmass.

Which land connection joins the two Americas?

The Isthmus of Panama is the narrow land connection between North America and South America.

Which oceans lie west and east of the Americas?

The Pacific Ocean lies to their west, and the Atlantic Ocean lies to their east.

What are the capitals of Canada and Brazil?

Ottawa is Canada's capital, while Brasília is the capital of Brazil.

How do a river and its basin differ?

A river is a flowing body of water; its basin is the area drained by it and its tributaries.

What does Canadian lumbering supply?

It supplies wood for timber products and for processing into pulp used in paper and related products.

Why is “almost every day” important when describing Amazon rainfall?

It describes very frequent rain while avoiding the incorrect claim that rain falls continuously without a break.

Why is regrowth important in the slash-and-burn sequence?

Young trees grow on the abandoned patch, helping restore soil fertility before the land is cultivated again.