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atmosphere

a blanket of air

trotosphere

the layer closest to the earth

air pressure

the weight of air pressing down to earth

local wind

a wind that results from a local difference in temperature

prevailing winds

global winds that always blow from the same direction

water cycle

water that continuously moves from earth's surface to the atmosphere and back to earth

evaporation

during a part of the water cycle liquid water changes to gas

condensation

when water changes from a gas to a liquid

humidity

the amount of water vapor in the air

precipitation

water that falls from the atmosphere to earth's surface

air mass

a large body of air that has the same temperature and humidity throughout

front

border where two air masses meet

climate

the pattern of weather an area experiences over a long period of time

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