What is atmosphere? Draw a neat figure showing the various layer of atmosphere.
The thick layer of air that surrounds the earth'scrust is called atmosphere.
Stratosphere is called protective umbrella. Why?
The uppermost layer of stratosphere contains the ozone layer. This thick layer of air absorbs much of the solar radiation and shields the earth from the harmful ultraviolet radiation. It prevents us from dangerous diseases. Therefore, the stratosphere is called a protective umbrella.