The key special chemical used by chemosynthetic communities at hot vents is ________.
A. silicate
B. nitrate
C. phosphate
D. methane
E. hydrogen sulfide
Answer: E
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The environmental lapse rate typically decreases at night because
A) the surface absorbs more longwave radiation than the air aloft B) the surface absorbs less longwave radiation than the air aloft C) the surface cools more slowly than the air aloft D) the surface cools more rapidly than the air aloft
Which is not a characteristic of clay minerals that increases the likelihood of a slide?
A) resistance to weathering B) shrinking and swelling due to water and temperature C) low cohesive strength when wet D) low friction when wet
Vast, circular to elliptical dark-colored areas on the moon called maria represent ________
A) large volcanos B) large lowlands that were sea-beds when the moon had water C) very large impact craters filled with basaltic lava D) remnant highlands produced from a time when the moon was entirely molten
The newest bonanza for recycling scarce and toxic metals is to recover them from ________
A) e-wastes such as computers B) car batteries C) compact discs, LPs and 8-track tapes D) closed landfills E) construction sites