How does the atmosphere act as a blanket?

Explanation

Atmoshpere acts as a protective blanket for the organisms to exist. It keeps the average temperature of the earth fairly steady during the day and even during the course of whole year. In addition, the oone shield (high concentration of ozone about 18-50 km above the surface of the earth) of the atmosphere absorbs most of the harmful UV radiations coming from the sun thereby protecting man and animals from their harmful effects.