Question

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

Answer 1

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