Why is infrared radiation emitted from earth?

Question

A. The earth emits infrared radiation because of radioactive decay of dead organisms.
B. The earth absorbs radiation from the sun and then emits it as heat, or infrared radiation.
C. The earth cannot absorb or emit infrared radiation because its wavelengths are too long.
D. The earth can emit infrared radiation because its core and mantle are very hot.

Answer 1

The correct answer is: B. The earth absorbs radiation from the sun and then emits it as heat, or infrared radiation.

The Earth absorbs solar energy, primarily in the form of visible light. After absorbing this energy, the Earth warms up and then emits that energy back into the atmosphere and space as infrared radiation, which has longer wavelengths. This process is part of the Earth's energy balance and is crucial for maintaining the planet's temperature.