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Air Pressure
A measure of the
force of the air
pressing down on
earth.
Atmosphere
The air that
surrounds the earth
made up of
different layers.
Barometer
Instrument used to
measure air
pressure
Cirrus Clouds
Feathery clouds
made of ice
crystals that are
usually associated
with fair weather.
climate
The average of all
weather conditions
of an area over a
long period of time.
condense
When water vapor
turns back into
liquid.
cumulonimbus
Tall, dense clouds
associated with
thunderstorms.
Cumulus clouds
Fluffy, white clouds
that look like cotton
balls and are
usually associated
with fair weather.
evaporation
The process in
which liquid water
turns into gas or
water vapor.
fog
Forms when
condensed water
floats in the air
near the ground.
front
Formed when two
air masses with
different properties
meet.
humidity
The amount of
moisture in the air.
hurricane
A powerful storm
originating in the
ocean that brings
heavy rains and
severe winds.
precipitation
The process by
which water
returns to the
Earth, in the form
of rain, snow, etc.
Rain gauge
A straight sided
container with a
flat bottom used to
measure rainfall.
runoff
Water from rain or
snow that flows on
the ground and
eventually into
streams.
Stratus clouds
Thick, layered gray
clouds that form
blankets in the sky
and are associated
with rain or snow.
temperature
Heat that can be
measured in
degrees Fahrenheit
or Celcius.
thunder
Occurs when there
is a violent
expansion of air
that has been
heated by
lightening.
tornado
A destructive funnel
shaped windstorm.
troposphere
Layer of Earth’s
atmosphere where
weather takes
place.
Weather vane
An instrument used
to measure the
direction of the
wind.