Science Chapter 20

A huge body of air in the troposphere with approximately uniform temperature and humidity

• Air Mass

• Continental air mass

• Artic air mass

• Maritime air mass

• Tropical air mass

A low-humidity air mass originating over land.

• Air mass

• Continental air mass

• Artic air mass

• Maritime air mass

• Tropical air mass

A high humidity air mass originating over the oceans

• Continetal air mass

• Artic air mass

• Maritime air mass

• Tropical air mass

• Polar air mass

A frigid air mass originating over the poles

• Continental air mass

• Artic air mass

• Maritime air mass

• Tropical air mass

• Polar air mass

A warm air mass originating in the tropics

• Continental air mass

• Artic air mass

• Maritime air mass

• Tropical air mass

• Polar air mass

A cool or cold air mass originating over upper latitudes

• Continental air mass

• Artic air mass

• Maritime air mass

• Tropical air mass

• Polar air mass

The boundary where at least two different air masses meet

• Front

• Orographic lifting

• Frontal wedging

• Convergence

The upward movement of air masses as they flow over mountains

• Front

• Orographic lifting

• Frontal wedging

• Convergence

The lifting of a warm air mass above a cold air mass acting as a wedge

• Front

• Orographic lifting

• Frontal wedging

• Convergence

The lifting of air into the atmosphere when horizontal air currents from opposite directions collide

• Front

• Orographic lifting

• Frontal wedging

• Convergence