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3 Cards in this Set
- Front
- Back
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One-fifth of Earth's total freshwater supply is in ________.
A.ponds B.estuaries C.the ocean D.groundwater E.the tundra |
D. groundwater
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Precipitation that falls on Earth's surface ________.
A.mostly runs off into salt marshes or the ocean B.may take a variety of pathways through surface water or groundwater flow C.is usually already unusable because of acid rain D.almost entirely filters down into the underground aquifers E. is mostly taken up by plants or other organisms |
B.may take a variety of pathways through surface water or groundwater flow
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An artesian aquifer occurs when ________.
A. a well is dug through layers of sand and gravel into the water table B.there are several aquifers that have merged C.a waterbearing layer is trapped between two layers that are less permeable D.a waterbearing porous layer of rock, sand, or gravel has accumulated groundwater over a long period of time E. granite is overlain by a sandy substrate, allowing percolation into the aquifer |
C.a waterbearing layer is trapped between two layers that are less permeable
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