Question

multiple - choice question
what do greenhouse gases do?
allow heat to leave the atmosphere
trap heat in the atmosphere
none of the above

Explanation:

Greenhouse gases such as carbon - dioxide, methane etc. act like a blanket in the Earth's atmosphere. They allow sunlight to enter the atmosphere but trap the heat (infra - red radiation) that is radiated back from the Earth's surface, leading to the greenhouse effect.

Answer:

Trap heat in the atmosphere