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20 Cards in this Set

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