8.1-8.4: Human Population Notes:

Human Population Distribution and Density

Population Distribution

• Refers to where people live globally.

• Uneven: concentrated in fertile river valleys, coastal plains, temperate climates.

• Sparse in deserts, mountains, polar regions.

Physical Factors Affecting Distribution

• Relief: flat land easier for farming, building, transport.

• Climate: temperate climates attract settlement; extremes (deserts, polar) discourage.

• Soils: fertile soils (volcanic, alluvial) support agriculture.

• Water supply: rivers, lakes, rainfall encourage settlement.

• Natural hazards: earthquakes, floods, drought discourage settlement.

Human Factors Affecting Distribution

• Economic: jobs in cities, trade routes, industrial zones.

• Political: stable governments attract people; conflict zones see out‑migration.

• Social: cultural/religious centers, education, healthcare.

• Infrastructure: transport, electricity, housing encourage settlement.

Population Density

• Definition: number of people per unit area (e.g., per km²).

• High density: urban centers (Tokyo, Cairo, London).

• Low density: Sahara Desert, Siberia, Himalayas.

Changes in Population Size

Growth Curve of Populations

• Lag phase: slow growth, small population.

• Exponential (log) phase: rapid growth, birth rate > death rate.

• Carrying capacity: maximum population environment can support.

• Humans can exceed carrying capacity due to technology (medicine, farming).

Changes in Human Populations

• Birth rate: influenced by healthcare, culture, religion, economy.

• Death rate: affected by healthcare, nutrition, sanitation, conflict.

• Migration:

  • Push factors: war, famine, unemployment, natural disasters.

  • Pull factors: jobs, safety, education, better living standards.

Population Structure

Population pyramids: graphical representation of age/sex distribution.

MEDCs (More Economically Developed Countries):

• Narrow base (low birth rate).

• Longer life expectancy, more elderly.

• Stable/declining population.

LEDCs (Less Economically Developed Countries):

• Wide base (high birth rate).

• Shorter life expectancy, fewer elderly.

• Rapidly growing population.

Managing Human Population Size

Strategies

• Family planning: contraception, education, awareness campaigns.

• Improved health & education: reduces infant mortality, empowers women, lowers fertility rates.

• National population policies:

  • Pronatalist: encourage births (e.g., France: tax breaks, childcare support).

  • Antinatalist: discourage births (e.g., China’s One‑Child Policy, incentives for smaller families).

NOTES DONE BY FARIDA SABET

CLICK HERE TO GO TO THE NEXT TOPIC

CLICK HERE TO GO TO THE PREVIOUS TOPIC

CLICK HERE TO GO BACK TO THE NOTES MENU