Explain what happens to the light ray when it travels through air and then into water

A Change of Course. Light travels faster through air than it does through a denser substance, such as water or glass.

So, when light rays travel through air and meet the surface of the denser substance, they are suddenly slowed down.

When this happens, the light rays bend.

c- cold periods in earth's history during which glaciers covered much of the surface.

explanation:

the answer would be c