Question

What would happen if earth had no atmosphere

Answer 1

Answer:

solar radiation would break atmospheric water into oxygen, which would react with carbon on the Earth to form carbon dioxide. The air would still be too thin to breathe. The lack of atmosphere would chill the Earth's surface. ... Plants and land animals would die

Explanation: rewrite it

Answer 2

Days would be extremely hot and nights would be extremely cold.

The energy of ultraviolet and shorter wave lengths of light is absorbed by interaction with the molecules in the atmosphere.

Explanation:
If there were no molecules in the atmosphere the high energy waves from the sun would strike the surface of the earth. The result would be that perhaps no living thing could survive.
Ozone and other molecules absorb the energy from the sun and undergo chemical reactions due to the energy absorbed.