Underground rivers can exist in

A) limestone aquifers.
B) science fiction.
C) all aquifers.
D) any of the above.


Answer: A

Physics & Space Science

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Two charged bodies separated by a distance d exert an electrical force on each other. The charge on one of the bodies is doubled. The electrical forces on each body now

a. double b. decrease by 1/2 c. stay the same d. differ—the force on the other body doubles, but the force on the body whose charge was changed stays the same as before e. increase by a factor of four

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What types of events ended the Paleozoic era?

What will be an ideal response?

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The total time it takes a projectile fired straight up at 10 m/s to reach the top of its path and return to its starting point is about

A) 1 s. B) 2 s. C) 10 s. D) 20 s.

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Erosion by alpine glaciers creates

A) V-shaped valleys. B) U-shaped valleys. C) drumlins. D) moraines.

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