Which use represents the largest share of freshwater in the U.S. that is withdrawn and not returned to its source?
A. crop irrigation
B. electricity production
C. municipal water use
D. motor boat use
Answer: A
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What do most climate change experts predict will happen to Central Asia?
A) It will be hit hard by climate change, leading to melting of glaciers and reduced river flows. B) Because of the region's low density, the problems will be minimal. C) This dry region will benefit from higher overall precipitation. D) The region will move to the forefront of solar energy technology development. E) This region will not be affected by climate change.
Old Faithful, a ________ in Yellowstone National Park, erupts steam and hot water
A) well B) spring C) geyser D) cone of depression
Which of the following is an example of a colloid in which a gas is dispersed in a liquid?
A) butter B) marshmallows C) mayonnaise D) whipped cream
Why does the distribution of benthic biomass mimic the distribution of surface water biomass?
a) these are areas of downwelling, where surface waters sink, providing nutrients for benthic organisms b) these areas of high productivity occur in the same location because these locations have the best environment c) food for most benthic organisms sinks to the seafloor from overlying surface water d) most of these places are shallow where sunlight penetrates to the seafloor, so photosynthesis can occur both in the water column and on the seafloor e) these areas have higher temperatures that are conducive to high productivity, whether it is benthic or pelagic