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State Tamil Nadu
Board State Board [Samacheer Kalvi]
Class 12th/HSC
Subject Geography
Medium English
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Document Type PDF

Samacheer Kalvi Class 12th Geography Book

Download Tamil Nadu Samacheer Kalvi Class 12th English Medium Geography Book PDF Free Online

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Download Samacheer Kalvi Class 12th Geography Book

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Introduction:
Do you know that 3,60,000 persons born every day in the world? Four births take place every second in the world. ‘Professor Stephen Hawking thinks the human species will have to populate a new planet within 100 years if it is to survive,’ the BBC confirmed.

‘With climate change, overdue asteroid strikes, epidemics and population growth, our own planet is increasingly precarious,’ the news outlet continued.

Human being is an important element of the environment and is probably the latest occupant of the earth, as its evolution took place less than two million years ago. Although distribution and growth of human population are infl uenced greatly by the physical environment, they have tremendous capacity to modify the physical environment.

Demography is the statistical study of human population. It includes the study of size, structure and distribution of population as well as changes in time and location in response to birth, migration, aging and death. ‘Population explosion’ is one of the greatest challenges that we are facing today.

Distribution of world population:
People have inhabited the earth for several thousands of years, but for a long period of time, their numbers remained limited. It is only during last few hundred years that human population has increased at an alarming rate.

Population is spread unevenly across the continents. Only a few areas support large concentration of people while vast areas support few people. A large number of factors influence the distribution and growth of population over the earth’s surface.

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