Question

Which gas in the upper atmosphere prevents ultraviolet radiations of the sun from reaching the earth?

Answer 1

Answer:

Ozone

layer is present in stratosphere

stratosphere also a layer of atmosphere

Answer 2

The gas in the upper atmosphere that prevents ultraviolet radiations of the sun from reaching the earth is ozone.

Explanation:

• The molecular formula of ozone is $O_3$.
• These molecules form a layer around the earth is called ozone layer.
• When UV rays produced from the sun reaches ozone layer before entering earth atmosphere.
• Ozone molecules absorb UV rays and forms Oxygen atoms, later, the atoms react with oxygen molecules to form ozone again.
• This cyclic process prevents harmful UV rays from entering earth.
• But global warming lead to hole in ozone layer and increase in global temperature.