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23 terms

Weather and Climate (4th Grade)

STUDY
PLAY
atmosphere
a mixture of gases that surrounds Earth
condensation
the process by which a gas changes to a liquid
cloud
a collection of tiny droplets or ice crystals that hangs in the air
air mass
a large body of air with similar properties all through it
front
a boundary between air masses with different temperatures
climate
the average weather conditions in an area over a long period of time
temperature
a measure of how hot or cold something is
humidity
the amount of water vapor in the air
air pressure
The force of air against earth's surface
thermometer
An instrument used to measure temperature
barometer
an instrument used to measure air pressure
wind vane
a tool that shows the direction from which the wind is blowing
evaporation
the process by which a liquid changes into a gas
water vapor
water in the form of a gas
freeze
to change state from a liquid to a solid
precipitation
The falling to earth of any form of water (rain or snow or hail or sleet or mist)
water cycle
the continuous movement of water between Earth's surface and the air, changing from liquid to gas to liquid
melt
to change state from a solid to a liquid
warm front
a boundary between air masses that allows a warm air mass to slide up and over a cold air mass
cold front
the boundary where a cold air mass moves under a warm air mass
stationary front
a boundary between air masses that are not moving
forecast
A prediction of what the weather will be like in the future
current
the directed flow of a gas or liquid