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