A) exacerbated by population growth.
B) caused by both wind and running water.
C) accelerated when land is cleared of its natural vegetative cover.
D) on a worldwide basis balanced by the continuous soil-forming processes.
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A) can cause problems hundreds of kilometers downwind of its source.
B) occurs when heated wastewaters are returned to the environment.
C) occurs because water expands as its temperature increases.
D) refers to oxygen-deficient water.
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A) hydrocarbons and inert gases.
B) PCB's and DDT.
C) oxides of sulfur and nitrogen.
D) halogens and halons.
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A) a decline in fish populations in thousands of lakes and streams.
B) global warming.
C) reduced rates of forest growth.
D) the corrosion and discoloration of buildings and statues.
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