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20 Cards in this Set
- Front
- Back
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abrasion
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the grinding action of rock fragments against a streambed and one another
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absolute dating
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the use of radioactivity to make accurate determinations of the earths age
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acid rain
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rain or snow that contains droplets of sulfuric acid and nitric acid
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air mass
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a large section of the troposphere in which the temperature and humidity are similar
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air pressure belts
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belts of high or low pressure that encircle the earth
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alluvial fan
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deposit formed by a stream that flows from the steep mountains out onto a broad flat plane
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altimeter
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a barometer that indicates altitude
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altitude
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the height (elevation) above sea level
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amber
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fossil tree resin that sometimes contain preserved specimens of insects
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anemometer
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instrument used to measure wind speed
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aneroid barometer
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a type of barometer used to measure air pressure that does not contain any type of liquid
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anthracite
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rock formed when bituminous coal is pressed and folded by moving blocks of crust, very hard coal
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anticyclone
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a high-pressure system in which the wind blows clockwise
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aquifier
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the water bearing layer of permeable rock in an artesian system
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argon
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chemically inert (inactive) element found in the atmosphere; used in light bulbs
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artesian system
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layers of impermeable rock than enclose a layer of permeable rock, forming and natural pipe for ground water
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artificial satellite
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a spacecraft built by humans and placed in orbit to perform a specific task
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asteroids
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thousands of rocky fragments that revolve around the sun in circular orbits
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astronomer
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scientists who study the sun, moon, planets, and stars
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atmosphere
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the mixture of gases and solids that surround the earths lithosphere and hydrosphere
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