Chapter 30, Problem 1RAT

To determine

The correct option for the statement “Earth’s lower atmosphere is kept warm by”.

Answer to Problem 1RAT

The correct option for the statement “Earth’s lower atmosphere is kept warm by” is option (b).

Explanation of Solution

The Sun radiates energy in the form of electromagnetic waves of short wavelengths that move in a straight line with light speed. And some part of the total energy is captured by the Earth. The energy transferred in the form of radiation by the Sun to the Earth is mostly absorbed by the Earth's atmosphere.

In return, the ground radiates back this energy with a longer wavelength. And this radiation is termed as terrestrial radiation. The lower atmosphere that contains greenhouse gases absorbs most part of the radiation emitted by the ground and. This process makes the lower atmosphere warm.

Conclusion:

Therefore, the correct option for the statement “Earth’s lower atmosphere is kept warm by” is option (b).