The effects of land subsidence due to groundwater extraction are generally ____
a. ?problems for a period of months, until more groundwater seeps in to deep clays
b. ?permanent and irreversible
c. ?in effect for several years, until major storms irrigate the area
d. ?reversible by returning water to the aquifer
e. ?unpredictable and impossible to plan for effectively
ANSWER: b
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Indicate whether the statement is true or false.
The contraction of an ice sheet
A) is an example of a negative feedback mechanism. B) increases its overall albedo. C) leads to overall warming in the vicinity of the ice sheet. D) would argue against global warming. E) all of the above
On a surface weather map that shows an open wave cyclone, the warm sector can be observed?
a. ?between the cold and warm fronts. b. ?behind an advancing cold front. c. ?ahead of an advancing cold-occluded front. d. ?behind an advancing cold-occluded front. e. ?ahead of an advancing warm front.
Which of the following are pioneer species?
A) zebra mussels B) lichens C) aspen trees D) wolves and mountain lions E) beavers