Select the definition of diffusion. The gradual dispersal of one substance through another substance. The movement of a gas particle from one area to another. The escape of a gas through a small opening in a barrier into a region of lower pressure. The random motion of gas particles. Select the definition of effusion. The random motion of gas particles. The gradual dispersal of one substance through another substance. The escape of a gas through a small opening in a barrier into a region of lower pressure. The movement of a gas particle from one area to another.

The following are the definition for the following terms:

Explanation:

1.  Kinetic molecular theory:

(a) The particles that the compose a gas are so small compared to the distances between them that the volume of the individual particles can be assumed to be neglisible.

2.  The definition of a Diffusion:

(a) The movement of a gas particle from one area to another.

3.  The definition of Effusion:

(c) The escape of a gas thorugh a small opening in a barrier in to a region of lower pressure.

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.