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20 Cards in this Set

  • Front
  • Back
Air is
a mixture of gases.
Air is mostly
nitrogen and oxygen.
Air also contains small amounts of
other gases, such as carbon dioxide and water vapor.
Animals breathe oxygen,
which they use to release energy from food.
Plants us carbon dioxide to
make food.
Water vapor forms
clouds that can make rain and snow.
Amount of oxygen in our air is
21%
Amount of Nitrogen in our air is
78%
Atmosphere is the
blanket of air surrounding Earth.
The conditions of the atmosphere
create our weather.
Earth's atmosphere
has four different layers.
The layer closest to earth is
5 - 7 miles thick, contains most of the air particles, and all life exists here.
Space is
nearly empty of air particles.
The four properties of air are
air pressure, humidity, air temperature, and wind.
Humidity is a
measurement of how much water vapor is in the air.
Air over deserts are dry and air over lakes are
humid.
The force of air pushing on an area is
air pressure.
Cool air weighs more
than warm air in the same space.
Air that weighs more
has greater air pressure.
Air in motion is called
wind.