Any form of water that falls to Earth's surface from the clouds; includes rain, snow, sleet, and hail.

The measure of the force with which air molecules push on a surface.

The horizontal movement of air, caused by differences in air pressure.

The measure of the transparency of the atmosphere.

Any form of water that falls to Earth's surface from the clouds; includes rain, snow, sleet, and hail.

The measure of the force with which air molecules push on a surface.

The horizontal movement of air, caused by differences in air pressure.

The measure of the transparency of the atmosphere.

Any form of water that falls to Earth's surface from the clouds; includes rain, snow, sleet, and hail.

The measure of the force with which air molecules push on a surface.

The horizontal movement of air, caused by differences in air pressure.

The measure of the transparency of the atmosphere.

The measure of the force with which air molecules push on a surface.

A large body of air with the same temperature and moisture content throughout.

The measure of the transparency of the atmosphere.

The condition of Earth’s atmosphere at a certain time/place, including temperature, humidity, precipitation, wind, and visibility.

Two air masses remain in place.

Warm air mass moves over a cold air mass.

Cold air mass moves under a warm air mass.

The boundary between air masses.

Two air masses remain in place.

Warm air mass moves over a cold air mass.

Cold air mass moves under a warm air mass.

The boundary between air masses.

Two air masses remain in place.

Warm air mass moves over a cold air mass.

Cold air mass moves under a warm air mass.

The boundary between air masses.

Two air masses remain in place.

Warm air mass moves over a cold air mass.

Cold air mass moves under a warm air mass.

The boundary between air masses.

A gradual increase in average global temperature.

The boundary between air masses.

The measure of the force with which air molecules push on a surface.

The angular distance north or south from the equator; expressed in degrees.

A long period of climatic cooling during which ice sheets spread from the poles.

Cold air mass moves under a warm air mass.

The condition of Earth’s atmosphere at a certain time/place, including temperature, humidity, precipitation, wind, and visibility.

The measure of the force with which air molecules push on a surface.

A long period of climatic cooling during which ice sheets spread from the poles.

The weather conditions in an area over a long period of time.

A gradual increase in average global temperature.

Warm air mass moves over a cold air mass.