Earth : The earth is in the third position from the sun and the fifth largest planet in the solar system. The earth is a ball flattened at the pole with slight bulge at the centre (equator). The rotation of earth at high speed has caused its mass to bulge at the equator . The earth is made up of number of concentric layers of material.
Composition | Percentage |
Oxygen | 46.6 |
Silicon | 27.72 |
Aluminium | 8.13 |
Iron | 5.01 |
Calcium | 3.63 |
Sodium | 2.85 |
Potassium | 2.62 |
Magnesium | 2.09 |
The earth has four distinct spheres :
Lithosphere : Top crust which include land surface and ocean floor.
Hydrosphere : Water surface which includes oceans, seas, rivers and lakes.
Atmosphere : The cover of air that envelops the earth’s surface.
Biosphere : The Region where life exists.
Posted by : Vishal.Kalgutkar
Posted by : Vishal.Kalgutkar
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