Snow becomes glacial ice through a process of ____
a. evaporation and precipitation
b. freezing and evaporation
c. precipitation and refreezing
d. melting and refreezing
d
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A machine puts out 100 W of power for every 1000 W put into it. The efficiency of the machine is
A) 10 percent. B) 50 percent. C) 90 percent. D) 110 percent. E) none of the above
A copper concentration mill tends to locate near a copper mine because it is a
A) bulk-reducing industry. B) perishable industry. C) bulk-gaining industry. D) specialized manufacturer. E) fabrication concentration point.
Which of the following cloud types is associated with tornado development?
A) cumulus B) nimbostratus C) altocumulus D) cumulonimbus
This figure shows the depth of the troposphere over the Earth. Why is the troposphere deepest over the Equator? Select one:
a. Differences in heating b. Differences in land versus ocean c. Differences in longitude d. Differences in the tilt of Earth's axis e. Differences in cloudiness