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FOUR SPHERE OF ENVIRONMENT

The natural environment can be broadly divided into four spheres, le. Lithosphere , Atmosphere , Hydrosphere and Biosphere . Each of these is unique in its own way and supports others in sustaining life forms on our planet called the Mother Earth . Let us understand the importance of each sphere of the natural environment. Lithosphere The literal meaning of 'lithosphere' is the 'sphere of rocks". The earth's solid layer is called lithosphere .  The lithosphere is about 100 km in thickness. The uppermost part of the lithosphere is composed of rocks rich in silica and aluminium called sial. Below the sial layer, the rocks are mainly rich in silica and magnesium and are called sima, which is generally found below the bottom of the ocean basing Thus, lithosphere is that part of the earth which provides us land over which we live. It provides soil for the plants and is also a source of all the mineral wealth.   Atmosphere  The literal meaning of 'atmosphere is the ...
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Hydrosphere

 Hydrosphere refers to the 'sphere of water' which is present in oceans, rivers, lakes and other water bodies on the earth's surface. The planet earth is often called the Water Planet or the Blue Planet because of abundance of water on its surface. The water bodies that include rivers, lakes, seas and oceans cover 71 per cent of the earth's surface. The distribution of water is not uniform in both the Northern and the Southern Hemispheres. It is estimated that 43 per cent of the total area covered by water lies in the Northern Hemisphere whereas the remaining 57 per cent lies in the Southern Hemisphere. Oceans hold 96.5 per cent water on the earth. Rest of the water is available in the form of ice, water vapours, underground water, rivers and lakes.
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