Q.Define the term ‘density of population’. Elaborate any four geographical factors that influence the distribution of population in the world.

The density of population is a measure that tells us how many people live on average in a unit area of land, usually expressed as the number of persons per square kilometre. It helps us understand whether a region is crowded or sparsely populated.

Four key geographical factors that influence the distribution of population across the world are:

• Relief or Terrain: Flat plains and river valleys are generally densely populated because they are easy to build on and suitable for farming. In contrast, mountainous, rugged, or hilly areas discourage settlement and tend to have low population densities.
• Climate: People prefer to live in regions with a moderate and comfortable climate. Extremely hot deserts, very cold polar areas, and regions with heavy rainfall are sparsely populated, while temperate and tropical monsoon climates support higher densities. …

Density of population is a simple but revealing measure: it tells us how many people, on average, live in a given unit of land area, usually expressed as persons per square kilometre. It is calculated by dividing the total population of a region by its total land area. A high density means many people are packed into a small space; a low density means the land is sparsely inhabited. But density alone does not tell the whole story — it is the pattern of density across the world that reveals the deep influence of geography.

Why do some parts of the world teem with people while others remain nearly empty? The answer lies in a handful of geographical factors that have, for centuries, guided where humans choose — or are forced — to live. Let us examine four of the most important ones.

1. Terrain and relief. Flat, low-lying land is far more attractive for settlement than rugged mountains or steep slopes. Plains offer ease of construction, farming, road-building, and movement. That is why the Indo-Gangetic Plain, the North China Plain, and the plains of Western Europe are among the most densely populated regions on Earth. In contrast, the Himalayas, the Andes, and the Rockies are sparsely populated — the steep slopes, thin soils, and difficult access make large-scale human habitation hard. People do live in mountains, but usually in valleys and at lower elevations, not on the high ridges.

2. Climate. Human beings are tropical animals at heart, but we thrive best where the climate is neither too hot nor too cold, neither too wet nor too dry. The moderate climates of the mid-latitudes — with mild summers, cool winters, and reliable rainfall — support the highest population densities. Western Europe, eastern North America, and parts of East Asia fall into this zone. Extremes are hostile: the scorching heat and aridity of the Sahara, the Arabian Desert, and the Australian outback keep densities extremely low. Similarly, the bitter cold of Siberia, northern Canada, and Greenland repels dense settlement. The world's population is overwhelmingly concentrated in the temperate and subtropical zones, not in the frozen poles or the burning deserts. …