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A watershed is


A) a layer of permeable material capable of storing groundwater.
B) the land area drained by a stream.
C) the amount of precipitation released by a rainstorm.
D) the amount of water stored in the ground and in reservoirs.

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Water that falls in eastern Colorado eventually ends up in the Atlantic Ocean.

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The two most common ions in seawater are sodium and


A) calcium.
B) carbonate.
C) magnesium.
D) chlorine.

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Which of the following statements about seamounts is false?


A) They are steep volcanic peaks in ocean basins.
B) They are most common in the Pacific Ocean.
C) Islands are seamounts that are higher than sea level.
D) Iceland is an example of a giant seamount in the Atlantic Ocean.

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About what is the average concentration of salts in Earth's oceans?


A) 0.35%
B) 3.5%
C) 35%
D) None of the above.

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Plant life in the upper, sunlit water tends to reduce the concentration of carbon dioxide and increase the concentration of dissolved oxygen gas.

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A current that moves parallel to the shore in the surf zone is called a


A) rip current.
B) longshore current.
C) undertow.
D) turbidity current.

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The greatest use of fresh water in the United States is for industrial purposes.

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The water table is an underground layer of water that tends to follow the topography of the surface.

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A layer of heavy clay after a rain would be


A) highly porous and permeable.
B) quite porous, but not very permeable.
C) not very porous, but quite permeable.
D) neither porous nor permeable.

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