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Pollution Answer Key

Substances released into the air are known as                .
  1. emissions
  2. expulsions
  3. depositions
  4. absorptions
Acid rain forms when gases in the atmosphere react with
  1. water vapor.
  2. smog.
  3. ozone.
  4. sulfur oxide.
The thick, brownish haze formed when certain gases in the air react with sunlight is known as
  1. the ozone layer.
  2. photochemical smog.
  3. a temperature inversion.
  4. the greenhouse effect.
Two harmful gases that can pollute the air indoors are
  1. ozone and carbon dioxide.
  2. carbon dioxide and CFCs.
  3. nitrogen and sulfur.
  4. carbon monoxide and radon.
The water and human wastes that are washed down sinks, toilets, and showers is called
  1. emissions.
  2. sewage.
  3. groundwater.
  4. sediments.
Global warming focuses on an increase in the level of which gas in the atmosphere?
  1. Carbon Dioxide
  2. Nitrous Oxide
  3. Sulfur Dioxide
  4. Ozone
Most water pollution is caused by                   .
  1. volcanic eruptions
  2. sediments
  3. human activities
  4. droughts
What is pollution that comes from many different sources that are often hard to identify?
  1. sludge
  2. point source
  3. nonpoint source
  4. smog
Polluted groundwater is difficult to clean up because
  1. groundwater is deep in the ground and dispersed through large areas of rock.
  2. pollutants cling to the materials that make up the aquifer and contaminate the clean water.
  3. the recycling process of groundwater can take hundreds or thousands of years.
  4. all of the above
Fertilizers flowing into a lake can cause the rapid growth of algae. How does the rapid growth of the algae affect the ecosystem of a lake?
  1. It attracts more birds and other wildlife to the lake.
  2. It prevents the loss of habitats for fish and other organisms.
  3. It causes a rapid increase in the population of fish in the lake.
  4. It causes a rapid increase in the population of plants in the lake.
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