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a mixture of gases that surrounds a planet or moon
atmosphere
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the measure of the force with which air molecules push on a surface
air pressure
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the lowest layer of the atmosphere, in which temperature decreases at a constant rate as altitude increases
troposphere
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the layer of the atmosphere that is above the troposphere and in which temperature increases as altitude increases
stratosphere
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the layer of the atmosphere between the stratosphere and the thermosphere and in which temperature decreases as altitude increases
mesosphere
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the uppermost layer of the atmosphere, in which temperature increases as altitude increases
thermosphere
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the transfer of energy as electromagnetic waves
radiation
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the transfer of energy as heat through a material
thermal conduction
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the movement of matter due to differences in density; the transfer of energy due to the movement of matter
convection
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the warming of the surface and lower atmosphere of Earth that occurs when water vapor, carbon dioxide, and other gases absorb and reradiate thermal energy
greenhouse effect
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a gradual increase in average global temperature
global warming
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the movement of air caused by differences in air pressure
wind
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the apparent curving of the path of a moving object from an otherwise straight path due to the Earth's rotaion
Coriolis effect
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prevailing winds that blow from east to west between 60 degrees and 90 degrees latitude in both hemispheres
polar easterlies
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prevailing winds that blow from west to east between 30 degrees and 60 degrees latitude in both hemisphers
westerlies
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prevailing winds that blow northeast from 30 degrees north latitude to the equator and that blow southeast from 30 degrees south latitude to the equator
trade winds
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a narrow belt of strong winds that blow in the upper troposphere
jet stream
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the contamination of the atmosphere by the introduction of pollutants from human and natural sources
air pollution
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rain, sleet, or snow that contains a high concentration of acids
acid precipitation
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