Radon is a radioactive gas found in certain soils,rocks,and natural building materials.
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Q80: Carbon monoxide is a colorless and odorless
Q81: The concentration of greenhouse gases is increasing
Q82: Electronic items,batteries,and fluorescent lights should be disposed
Q83: In the upper atmosphere,ozone is a harmful
Q84: The term smog was first used in
Q86: Key sources of chlorofluorocarbons are solvents,refrigerants,and propellants.
Q87: Biomagnification occurs when larger animals eat smaller
Q88: Food waste makes up a larger portion
Q89: Biological pollutants are often found in bathrooms,damp
Q90: Surface water is likely to be contaminated
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