| Acid Rain |
rainwater having a low pH as a result of air pollution |
| Aerosols |
tiny particles in the atmosphere, so small and light that the slightest movements of air keep them aloft
|
| Air |
a mixture of gases that surrounds the Earth
|
| Air Mass |
body of air within which temperature and moisture are uniform
|
| Air Pollutant |
an unwanted substance injected into the atmosphere from the Earth’s surface by either natural or human activities
|
| Air Temperature |
temperature of air, normally observed by a thermometer under standard conditions of shelter and height above the ground
|
| Angle of Repose |
inclination of a slope consisting of loose, coarse, well-sorted rock
|
| Annuals |
plants that live only a single growing season, passing the unfavorable season as a seed or spore
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| Antarctic Circle |
parallel of latitude at 66°S
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| Aphelion |
point on the Earth’s orbit at which the Earth is farthest from the Sun
|
| Aquifer |
rock layer that holds groundwater
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| Arc |
curved line that forms a portion of a circle
|
| Arctic Circle |
parallel of latitude at 66°N
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| Arid |
subtype of the dry climates that is extremely dry and supports little or no vegetation cover
|
| Artesian Well |
well in which water rises from the water table to the surface from pressure
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| Atmosphere |
layer of gases surrounding the Earth, held by gravity
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| Atoll |
a closed loop of coral reef surrounding an open lagoon with no island inside
|
| Autumnal Equinox |
equinox occurring on September 22 or 23
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| Axis of Rotation |
centerline around which a body revolves, as the Earth’s axis of rotation
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A |
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