What is the triple point on a phase diagram?
A. A point indicating three phases in dynamic equilibrium
B. A line on a phase diagram showing a phase transition
c. A region on a phase diagram indicating the vapor phase
D. A point on a phase diagram where all change has stopped

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.

gas

explanation:

smoke is the matter of a gas

level 4 to level 2 : ))