Stratosphere extends from 8−16 to 30−50km. Temperature shows a gradual increase with increase in altitude. It includes much of ozone Saver. Troposphere is nearest to earth. in this. Temperature drops to −56∘C by the time of an altitude of about 16−18km is reached. Mesosphere, above stratosphere, extends roughly to 80km and its temperature drops −2∘C to between -80 and −94∘C at the mesopause, Atmosphere is a insulating of air around the earth.