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Environment.

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    Environment and environmental problems.
  •   Study   Slideshow
  • A tropical forest, usually of tall, densely growing, broad-leaved evergreen trees in an area of high annual rainfall.
    Rainforest
  •  10
  • The number of a people in an area exceeds the capacity of the environment to support life at a decent standard of living.
    Overpopulation
  •  15
  • The removal of trees faster than forests can replace themselves.
    Deforestation
  •  15
  • Air pollution by a mixture of smoke and fog.
    Smog
  •  15
  • The process by which fertile land becomes desert,typically as a result of drought, deforestation, or agriculture.
    Desertification
  •  15
  • An extreme shortage of food.
    Famine
  •  15
  • Disappearance of a species from all parts of its geographical range.
    Extinction
  •  20
  • Natural situation in which heat is retained in Earth's atmosphere by carbon dioxide, methane, water vapor, and other gases.
    Greenhouse effect
  •  10
  • Rain that contains more acid than normal.
    Acid rain
  •  5
  • The shaking that results from the movement of rock beneath Earth's surface.
    Earthquake
  •  5
  • A long period of dry weather.
    Drought
  •  15
  • A slide of a large mass of dirt and rock down a mountain or cliff.
    Landslide
  •  10
  • A rapidly spreading and usually fatal disease.
    Pandemic
  •  15