What is an air mass?

• large body of air that has the same temperature and moisture level throughout

• warm air mass stretches over cold air mass; produces steady, light rain or sleet

• boundary where two air masses meet and weather occurs

• cold air mass pushes warm air mass up; produces heavy rain, thunderstorms, or snow

The process in the water cycle in which the sun heats the water on land and turns it into water vapor is __________.

• condensation

• collection

• evaporation

• precipitation

The process in the water cycle in which water vapor collects as a cloud and cools off is __________.

• condensation

• collection

• evaporation

• precipitation

heavier, sinking air

• high pressure

• low pressure

clear, sunny skies

• high pressure

• low pressure

Which letter represents High pressure?

• A

• B

The weather forecast tomorrow says there will be a 15 mph northeast wind and a high temperature of 52 degrees. What three instruments will a meteorologist use to make this prediction?

• anemometer, wind vane, thermometer
• barometer, hygrometer, wind vane
• thermometer, satellite image, hygrometer
• wind vane, satellite image, barometer

lighter, rising air

• high pressure

• low pressure

If a scientist were trying to determine how fast the wind was moving in a hurricane, what tool would they use?

• hygrometer

• compass

• barometer

• anemometer

______________is created by unequal heating of the Earth's surface.

• conduction

• radiation

• wind

• river movement