Glass windows allow light in, but trap the heat inside. this describes a greenhouse effect convection global warming conduction

The correct answer is green house effect.

Explanation:

Green house effect: It is a process in which the infrared rays coming from the sun gets absorbed or re-emitted in the atmosphere. In this way the heat is trapped in the atmosphere.

In the given problem, glass windows allow light in, but trap the heat inside. This effect is due to the green house effect.

Convection: It is a process in which there is an actual movement of heat particle.

Conduction: It is a process in which there is no actual movement of the particle. It transfers heat directly from one place to another.

Global warming: The gradual increase in the overall temperature of earth's atmosphere that causes change in the climate. It is the result of the green house effect.

Therefore, glass windows allow light in, but trap the heat inside. This describes green house effect.

reserve is the answer

one "light year" is the distance that light travels, through vacuum, in one julian year.   that's 365.25 days, of 24 hours each.