WORLD GEOGRAPHY
Earth: The earth constitutes land, water and air Land is made up of rocks and soil. It is distributed in continents and islands. The water found in oceans, seas, lakes, etc. occupies about 2/3 of the earth's surface. The earth is surrounded by a cover of air, called atmosphere, which extends up to several hundred kilometres above its surface.
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shape: In ancient time people believed that the earth was flat in shape. Greek philosopher Pythagoras (6th century BC) was the first person to declare that the earth was round. After careful measurement, the scientists have found that the earth is slightly oblate and not exactly round
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