9 February 2015

Physical Geography

Physical Geography (Download in PDF)

In the previous article, you have learnt about Notes on IT Questions.In this article, you will learn about Physical Geography. It is not full article, to read full article you have to download it.

Physical Geography

The Earth—Its Motions and their Effects
The earth has two motions, viz., (1) Rotation around its axis or the daily motion. The axis of the earth is an imaginary line inclined at 66.5° to the plane of the orbit of the earth. The earth rotates round its axis from west to east once in 24 hours. Effects: Days and nights are caused. The sun, moon and other heavenly bodies appear to revolve round the earth from east to west. Direction of winds and currents is changed.

(2) Revolution round the sun on its orbit, or the annual motion: The earth revolves round the sun once in about 365.25 days. Effects: It causes seasons; days and nights are of unequal length at the same place.

Important elements in the earth’s crust
The five most abundant elements in the earth’s crust are: Oxygen, Silicon, Aluminium, Iron and Calcium. (The other three are Sodium, Potassium and Magnesium.)

Oceans—Their Importance
Oceans are the source of all water on earth as the evaporated water from over their surface is brought to earth by the winds passing over them. They are the highways of the world and most of the world trade is carried through the sea. Innumerable fish and other animals living in the oceans are a great source of food to mankind. Minerals like salt, iodine etc. are derived from the ocean waters and sea-weeds.

Ocean Currents: are rivers of warm or cold water flowing in an ocean. Their banks and beds also consist of water.

Natural Regions
A natural region is a large area in which the topography, climate and vegetation are largely similar, and therefore there is a certain 

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