CBSE Class 8 Geography: Human Resources – Detailed Revision Notes & Concepts

Human beings are a nation's greatest asset because the gifts of nature become meaningful resources only when people possess the skills, health, and knowledge to utilize them. This chapter explores how global populations are distributed, the geographical and socio-economic factors that govern settlement patterns, and how demographic metrics like birth rates and population pyramids illustrate a country's future. Designed specifically for CBSE Class 8 students, these notes prioritize conceptual clarity, precise definitions, and worked examples.

People as Resources and Global Population Distribution

A country's population is referred to as its human resource because physical resources like minerals, fertile soils, and water bodies cannot create value on their own. It is human intellect, labor, and technology that transform raw natural elements into usable goods and services. Therefore, investing in education and healthcare directly enhances the quality of human resources, a process known as Human Resource Development.

The pattern in which people are spread across the earth's surface is known as the pattern of population distribution. This distribution is extremely uneven:

• More than 90 percent of the world's population lives in roughly 30 percent of the total land area.
• Crowded regions include South and East Asia, Western and Central Europe, and North-Eastern North America.
• Extremely sparse areas include high-latitude polar regions, arid deserts, rugged mountainous terrain, and equatorial rainforests where harsh conditions limit survival.
• Roughly three-quarters of the global population resides across two continents: Asia and Africa.

Density of Population: Concept and Calculation

Population Density is defined as the average number of persons living in a unit area of the Earth's surface. It is universally expressed as persons per square kilometre (persons/sq km).

The mathematical formula to determine population density is:

Population Density = Total Population ÷ Total Land Area (in sq km)

Worked Example: Suppose a district has a total population of 600,000 people residing within a geographic boundary of 1,500 square kilometres. Its density is calculated as:

• Density = 600,000 ÷ 1,500 = 400 persons per sq km.

For global context, the average population density of the entire world is approximately 51 persons per sq km. In comparison, India is one of the most densely populated nations, recording an average density of 382 persons per sq km (Census 2011), with river valley regions like the Northern Plains exhibiting significantly higher concentrations.

Factors Influencing the Distribution of Population

The decision of human populations to settle in specific regions is shaped by an interplay of geographical, social, cultural, and economic factors.

1. Geographical Factors:

• Topography: People prefer living on flat plains rather than rugged mountains or steep plateaus because plains facilitate agriculture, transport network construction, and manufacturing. The Ganga Plains are among the most densely populated in the world, whereas the Himalayas remain sparsely inhabited.
• Climate: Moderate, temperate climates attract large settlements. Extreme climates, such as the freezing Arctic tundra or the scorching Sahara Desert, deter permanent human habitation.
• Soil: Fertile alluvial soils support intensive farming. The river basins of the Ganga-Brahmaputra in India, Hwang-He in China, and the Nile in Egypt sustain immense populations.
• Water: Freshwater is vital for domestic use, livestock, and industries. River valleys have historically formed the cradles of human civilizations.
• Minerals: Areas rich in mineral deposits naturally attract workers and infrastructure. For instance, diamond mines in South Africa and oil discoveries in the Middle East led to rapid settlement.

2. Social, Cultural, and Economic Factors:

• Economic Factors: Industrial cities offer abundant employment opportunities, drawing massive populations (e.g., Mumbai in India and Osaka in Japan).
• Cultural Factors: Places with deep religious or cultural importance attract people seeking spiritual or cultural community (e.g., Varanasi, Jerusalem, and Vatican City).
• Social Factors: Regions providing modern housing, superior schooling, and advanced medical infrastructure (such as Bengaluru or Pune) attract steady inflows of families.

Components of Population Change

Population change refers to the variation in the number of people living in a specific territory during a specific time period. The world population did not grow steadily throughout history; for millennia it grew very slowly due to high death rates caused by famines and incurable diseases. With modern advancements in agriculture, sanitation, and medical science, death rates plummeted while birth rates remained elevated, leading to a rapid population surge.

The three fundamental components governing population change are:

• Birth Rate: The number of live births per 1,000 people in a year.
• Death Rate: The number of deaths per 1,000 people in a year.
• Migration: The movement of people in and out of an area. Immigration occurs when individuals move into a country (increasing population), whereas Emigration occurs when people leave a country to settle abroad (decreasing population).

The difference between the birth rate and the death rate of a country is known as its Natural Growth Rate:

Natural Growth Rate = Birth Rate − Death Rate

If a nation has a birth rate of 22 per 1,000 and a death rate of 7 per 1,000, its natural growth rate is 15 per 1,000 (or 1.5% annually), independent of migration trends.

Population Composition and Age-Sex Pyramids

Knowing only the size of a population tells us little about its economic capability. Population composition refers to the demographic structure of a population, covering age groups, sex ratio, literacy rates, occupational patterns, and health status.

Demographers analyze this composition using a graphical tool known as a Population Pyramid (or Age-Sex Pyramid). The pyramid displays the total population divided into various age brackets (e.g., 0–4 years, 5–9 years, up to 80+ years), with males plotted on the left side and females on the right side.

The shape of the pyramid provides direct insights into a nation's dependency balance:

• Broad Base and Rapidly Narrowing Top (e.g., Kenya): A very broad base indicates high birth rates, but the steep taper in older age groups shows high infant/child mortality and fewer elderly people surviving. This reflects a high youth dependency burden.
• Broadening Base with Wider Middle (e.g., India): Shows declining infant mortality rates, allowing more children to survive into adulthood. This produces a large, expanding segment of working-age individuals (15–65 years), representing a strong demographic dividend.
• Narrow Base and Tapered Bottom (e.g., Japan): Low birth rates decrease the proportion of children at the base, while high life expectancy expands the top. This results in a low youth dependency ratio but a high elderly dependency ratio.

A population with a robust proportion of healthy, literate, and skilled people in the working-age group forms the backbone of sustained economic progress.

Key takeaways

• People are considered the ultimate resource because human skill, intellect, and technology convert natural materials into valuable assets.
• Population distribution across the globe is highly unequal, with over 90% of humanity occupying less than a third of the land surface.
• Population density measures the number of persons per square kilometre and is determined by dividing total population by total surface area.
• The natural growth rate of a population equals the Birth Rate minus the Death Rate; overall population size is further influenced by immigration and emigration.
• Population pyramids graphically illustrate demographic balance by showing the proportions of young dependents (below 15), the working-age group (15–65), and elderly dependents (above 65).

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