Hydroelectric power provides about ________ percent of the total energy needs of the United States.
A. 12
B. 2
C. 6
D. 17
Answer: B
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Land unsuitable for crops may be used for which of the following?
A. lumber B. grazing C. recreation D. All of these are correct.
Most of the oil that pollutes the ocean comes from ____.
A. blowouts (rupture of a borehole of an oil rig in the ocean) B. tanker accidents C. environmental terrorism D. urban and industrial runoff from land E. normal operation of offshore wells
Beneath an intense thunderstorm, the downdraft may become localized so that it hits the ground and spreads horizontally in a radial burst of wind. This is called a(n) ____
A) dry line B) outflow boundary C) squall line D) downburst
According to Newton, gravitational force between bodies is greater if the bodies have great
A. masses. B. distance between them. C. both of these D. neither of these