Human Geography SRPs, Essential Revision Notes

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Table of Contents

Population Change 3

Density vs. Distribution 3

Distribution 3

Density 4

Effects of Overpopulation 5

The Sahel Region in Africa 5

Over-cropping 5

Overgrazing 13

Migration 7

Ireland 7

Stages and Patterns 7

Population Change

Density vs. Distribution

Distribution

Global population distribution refers to the dispersal of people across the world, i.e. the number of people who live on each continent.

The world’s population is unevenly distributed around the world:

1. 90% of the world’s population live in the Northern hemisphere

2. 80% live below 500m above sea level

3. 70% live within 500km of the coast

On a global scale there are four distinct regions where most of the world’s population is located. These are found in sub-tropical regions, i.e. latitude 20 degrees to 40 degrees North, and temperate regions, i.e. latitude 40 degrees to 60 degrees North.

NAME OF REGION

REGION TYPE

LATITUDE

1.

The Indian sub-continent

Sub-tropical

20 – 40 North

2.

South – East Asia

Sub-tropical

20 – 40 North

3.

West & Central Europe

Temperate

40 – 60 North

4.

East coast of the U.S.A.

Temperate

40 – 60 North

On a global scale there are also four distinct types of regions that are very thinly populated, i.e. with few human inhabitants.

TYPE OF REGION

EXAMPLE

1.

Polar ice caps

Antarctica (South Pole)

2.

Mountainous regions

Himalayas (Asia)

3.

Hot desert regions

The Sahara (Africa)

4.

Equatorial rainforests

The Amazon (South America)

Density

Population density refers to the number of people living in a specific area. It is measured in the number of people per square kilometre.

The formula for population density = (NUMBER OF PEOPLE ÷ THE NUMBER OF SQ. KILOMETERS)

By Continent

1. Europe has an average/moderate percentage of the world’s population (12%) but has a high population density as the landmass is small.

2. Oceania has a low percentage of the world’s population (0.5%) and a large landmass; therefore it has a low population density.

3. Asia: A...

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