Chapter 34 Review: Planet Under Stress


  1. The biggest factor for the extinction of species is
    1. habitat loss.
    2. overexploitation.
    3. introduced species.
    4. chemical pollution.
    5. global warming.
  2. A lack of ozone is dangerous because ozone
    1. is a reserve for oxygen that we breathe.
    2. cools the earth.
    3. filters out dangerous ultraviolet rays.
    4. triggers the development of clouds.
    5. is a greenhouse gas.
  3. Which of the following can cause acid rain?
    1. soil erosion
    2. coal-burning power plants
    3. a decrease in the ozone layer
    4. clear-cutting forests
    5. nuclear reactors