According to general circulation models,
A) none of the observed warming in the last century was caused by human activity.
B) all of the observed warming in the last century was caused by human activity.
C) some of the observed warming in the last century was caused by human activity.
Answer: C
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When the speed of a ball increases by the same amount each second, its acceleration
A. varies. B. also increases each second. C. decreases each second. D. is constant.
Objections to the "stepping-stone" hypothesis, suggesting that deep-sea hydrothermal vent organisms are dispersed by taking advantage of whale falls (like stepping-stones), include all of the following except ________.
A. the number of overlapping species found at multiple sites is small B. chemosynthetic organisms found at whale falls are not the same as at hydrothermal vents C. most whales live and die in shallow waters D. increasing numbers of vents found suggest that dispersal is not a problem
A major economic deposit associated with the Cretaceous period is ________
A) platinum B) sand C) uranium D) gold E) coal
On the standard pH scale, the number 10 indicates a ________ soil
A) acid B) neutral C) basic (or alkaline) D) fine-textured E) porous