Define the terms Atmosphere, Biosphere.

Explanation

Atmosphere: The blanket of gases that surrounds the earth is called Atmosphere. It Contains large proportions of `N^2` and `O_2` and in small proportions `CO_2` water vapor etc. It absorbs the harmful radiation coming from the sun and plays an important role in maintaining the heat balance on earth.
Biosphere: All living organisms, trees, plants, animals and human beings constitute Biosphere. This biosphere is interrelated to other segments of environment. Biosphere is dependent on atmosphere and hydrosphere.