Question

Select the correct answer from the list. (2 points)
In the greenhouse effect, far infrared radiation is (emitted and absorbed by/emitted from/absorbed by) Earth's surface and absorbed and reemitted by (all/some) gases in the atmosphere.
These gases have (increased/decreased/been unchanged) in concentration over the past century.

Answer 1

In the greenhouse effect, far infrared radiation is **emitted and absorbed by** Earth's surface and absorbed and reemitted by **some** gases in the atmosphere. These gases have **increased** in concentration over the past century.