Of the 28 million individuals in the U.S. with impaired hearing, about ________ have hearing loss at ...

Of the 28 million individuals in the U.S. with impaired hearing, about ________ have hearing loss at least partly related to damage from noise.
 
  A) 10 percent
  B) one-quarter
  C) one-third
  D) half

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Industrialized nations have a larger ecological footprint than less developed countries.
 
  Indicate whether the statement is true or false.

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Why is using a commercial car wash more ecologically sound that washing your car at home?
 
  A) Commercial car washes recycle and reuse the water.
  B) Commercial car washes are required, by EPA regulation, to be more ecologically sound.
  C) All commercial car wash soaps and waxes are biodegradable.
  D) Most commercial car washes are better equipped to handle wastewater.

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When sulfur dioxide and nitrogen oxide are released into the air and react with other airborne matter, they may form what compound?
 
  A) hydrocarbon
  B) smog
  C) acid
  D) trioxide or ozone

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The conversion of organic waste into a natural fertilizer is called
 
  A) composting.
  B) mulching.
  C) thatching.
  D) biomass conversion.