Q.9. State the functions of:
(i) Lithosphere
(ii) Hydrosphere and
(ii) Atmosphere.
Answers
(i) Lithosphere: The lithosphere is the upper rigid shell of the earth and is distinctly sub-divided into three layers. They are: the central one, or the core; the intermediate layer called the mantle; and the outer layer known as the earth’s crust. Seismic studies have made it possible to distinguish the solid part of the earth into such distinctive layers or zones.
(ii) Hydrosphere: The major importance of hydrosphere is that water sustains various life forms and plays an important role in ecosystems and regulating the atmosphere. Hydrosphere covers all water present on the Earth surface.
(ii) Atmosphere: The gaseous canopy that envelops the lithosphere and the hydrosphere is known as the atmosphere. It consists of a mixture of various gases and is believed to extend about 10,000 km above sea level. Held to the earth by gravitational attraction, the atmosphere has its maximum density at sea level and decreases rapidly upward
Explanation:
Q.9. (1) Lithosphere
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.
(2) Hydrosphere
It refers to the 'sphere of water' which is present in oceans, rivers, lakes and other water bodies on the earth's surface.
(3) Atmosphere
Atmosphere is the most dynamic is nature where changes occur not only from one season to another but also within a short period of time, say a few hours. These sudden changes in atmospheric conditions which affect our life both directly and indirectly