What stage of wastewater treatment would remove a condom that had improperly been flushed down a toilet?
A) Grit chamber
B) Activated-sludge system
C) Debris removal
D) Anaerobic digestion
C
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Explain how light and sound waves behave in seawater. What kind of effects do they have on inhabitants of the ocean?
Air pollution in Tehran ________
A) is caused primarily by vehicles unequipped with pollution control technology B) is caused mainly by very high levels of CFCs and acid deposition C) comes primarily from burning fuel wood D) has been reduced by 90% thanks to strict air pollution laws E) is far less serious than in Los Angeles
Prime agricultural land in the United States is being replaced with
A) military bases. B) urban land uses. C) nature preserves. D) oil drilling. E) grazing land use.
If one had the opportunity to walk on Triton, Neptune's largest moon, what would you observe the geysers to be spewing?
A. liquid hydrogen B. liquid water C. liquid oxygen D. liquid nitrogen