Visible light is a mixture of: a.) refraction and reflection b.) atoms and molecules c.) many colors or d.) ultraviolet and nonviolet rays ?

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)

a rain shadow is a dry region of land on the side that is protected against the prevailing winds of a mountain range. the prevailing winds are the winds that occur most of the time in a particular place of the earth

prevailing winds carry air toward the mountain range. as the air rises up over a mountain range, the air cools, water vapor condenses, and clouds form. on this side of the mountains, called the windward side, precipitation falls in the form of  rain  or snow. this dry air produces a  rain shadow.