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24 Cards in this Set
- Front
- Back
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nitrogen
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A colorless, odorless, tasteless gas that makes up about four fifths of the air.
Nitrogen is used by plants for growth. |
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oxygen
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A colorless, odorless, tasteless gas that makes up about one fifth of the air.
Oxygen is essential to life. |
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carbon dioxide
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A colorless, odorless gas. Plants use carbon dioxide from the air in the process of making food.
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water vapor
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Water that is in the form of a gas.
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atmosphere
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The blanket of air that surrounds Earth, reaching about 700 km above the surface.
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troposphere
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The layer of the atmosphere closest to the surface of the Earth.
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weather
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The condition of the atmosphere at a certain place and time
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greenhouse effect
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The process in which heat from Earth is trapped by the atmosphere.
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wind
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Moving air caused by the uneven heating of the Earth's surface.
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barometer
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A device that measures air pressure.
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air pressure
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The push of the air in all directions against its surroundings.
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high-pressure area
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An area of higher air pressure than that of the surrounding air.
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low-pressure area
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An area of lower air pressure than that of the surrounding air.
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wind vane
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A device, often shaped like an arrow, used to show direction of the wind.
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windsock
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A device used to show wind direction, consisting of a cloth bag that is open at both ends and hung on a pole.
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anemometer
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A device used to measure wind speed.
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water cycle
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The movement of water into the air as water vapor and back to Earth's surface as rain, snow, or hail.
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evaporate
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To Change from a liquid to a gas.
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condense
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To change from a gas to a liquid.
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cloud
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Billions of tiny drops of water that condensed from the air.
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precipitation
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Any form of water that falls from the air.
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rain gauge
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A device that measures precipitation.
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humidity
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The amount of water vapor in the air.
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relative humidity
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The amount of water vapor present in the air at a given temperature compared to the maximum amount that the air could hold at that temperature.
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