(a). Constituents of biosphere.
Atmosphere, hydrosphere, lithosphere and all living things on earth.
(b). Biotic constituents of soil.
Microbes, worms, insects, burrowing rhodents like rats, mice, roots of trees and plants.
(c). Fossil fuel.
Crude oil from which we get kerosene, petrol, diesel, paraffin wax and tar.
(d). Inert gases in air.
Neon, argon, helium, krypton, xenon.
(e). Gases that are harmful to ozone layer.
Chlorofluorocarbon and carbon tetrachloride.