The thin blanket of air that surrounds Earth.

A large body of air that has temperature and moisture similar to that of the area over whick it formed.

An instrument that measures the temperature of air.

Wispy clouds that are made up of ice crystals high in the atmosphere.

This happens to the space between air particles as you get higher in the atmosphere.

The atmosphere is made up of billions and billions of these.

When a warm air mass moves and catches up to a cold air mass.

An instrument that measures air pressure.

Low, gray clouds that form a layer and may bring light rain.

The energy from the sun is trapped by gases in the air.

The layer of air that is closest to Earth.

This happens when air pressure as a front moves into an area.

Scientists who study and measure weather conditions.

White, fluffy clouds that occur in fair weather.

The type of air mass that would form over tropical water.

The layer of air where most of Earth's ozone is.

This is what happens when the atmosphere traps heat near Earth's surface.

The amount of water vapor in the air.

When a cumulus cloud becomes a dark, towering storm cloud.

The front that forms when two air masses meet and don't move.

How the air pressure and temperature change with height.

This provides the energy to make weather.

This is what affects the humidity in the air.

The reason clouds help predict weather.

Why mountain climbers use oxygen tanks.