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Abney Elementary
Mrs. Delaup

The atmosphere is a thin blanket of air that
surrounds the Earth.

There are four layers of the atmosphere.

The layer closest to the Earth is the
troposphere. We live in the troposphere and
breathe in air. Almost all weather happens in
this layer.

Some airplanes that travel long distances fly in
the stratosphere, above the weather.

The mesosphere is the coldest layer of the
atmosphere.

The thermosphere is the hot, outermost layer
of air.

An air mass is a large body of air that has
temperature and moisture similar to that of
the area over which it formed. Ex: A warm,
moist air mass is most likely to form over the
Gulf of Mexico.

Humidity is the amount of water vapor in the
air.

A front is the area where two air masses meet
and where weather happens.

A cold front forms when a cold air mass
catches up with a warm air mass.

A warm front forms when a warm air mass
catches up to a cold air mass.

A cold front is represented with a line with
triangles.

A warm front is represented with half circles.

Cirrus clouds are a wispy white cloudS at a high
altitude.

Cumulus clouds are dense, white, fluffy, puffy
cotton-ball clouds.

Cumulonimbus clouds are towering dark clouds.
If you see them it will probably rain soon.

Stratus clouds form a low layer of dark gray.
You see these clouds on a gray cloudy day.

Air pressure(the weight) is measured with an
instrument called a barometer.

A thermometer measures the temperature of
air.

An anemometer measure wind speed.

A wind vane or wind sock measures wind
direction.

The water cycle is the constant recycling of
water from Earth’s surface to the atmosphere
and back to the Earth’s surface again.

Evaporation is the process in which liquid
changes into a gas.

Condensation is the process in which a gas
changes to a liquid.

Precipitation is rain, snow, sleet, or hail that
falls from the clouds. Precipitation forms when
water droplets get too large to stay in the
air/clouds.