A Planet Under Stress

Practice exam questions written by Timothy H. Heaton,
Professor of Earth Sciences, University of South Dakota

Click the circle by an answer with the mouse, then click on the Submit button to get a response. You will be told if your answer is correct or not and will be given some comments.

  1. About how many people currently inhabit the earth?
    1 billion.
    2 billion.
    4 billion.
    6 billion.
    8 billion.

  2. What is the chemical formula of ozone?
    O.
    O2.
    O3.
    NO.
    NO2.

  3. Where does the ozone layer reside?
    Biosphere.
    Hydrosphere.
    Mesosphere.
    Stratosphere.
    Troposphere.

  4. What type of radiation is absorbed by the ozone layer?
    Infrared light.
    Microwaves.
    Radio waves.
    Ultraviolet light.
    Visible light.

  5. Which element destroys ozone?
    Carbon.
    Chlorine.
    Hydrogen.
    Helium.
    Radon.

  6. What is the major source of ozone-depleting chlorine in the atmosphere?
    Automobile exhaust.
    Coal burning.
    Radioactive waste.
    Refrigerants.
    Sewage.

  7. Which of the following is a major compound in causing acid rain?
    Carbon dioxide.
    Carbon monoxide.
    Ozone.
    Nitrogen.
    Sulfur dioxide.

  8. What are the negative effects of acid rain?
    Deterioration of forests.
    Increased weathering rates.
    More metals dissolved in streams.
    Poisoning of fish.
    All of the above.

  9. When factories release gasses that cause acid rain, what area is effected?
    A regional area downwind.
    A regional area in all directions.
    A very local area.
    All areas downwind.
    The whole earth.

  10. What compound is the primary greenhouse gas causing global warming?
    Carbon dioxide.
    Chlorofluorocarbon.
    Nitrogen oxide.
    Ozone.
    Sulfur dioxide.

  11. What type of radiation is absorbed by greenhouse gasses?
    Infrared light.
    Microwaves.
    Radio waves.
    Ultraviolet light.
    Visible light.

  12. What factor does not contribute to increased CO2 levels in the atmosphere?
    Burning fossil fuels.
    Deforestation.
    Desertification.
    Nuclear energy.
    Water pollution.

Please report any problems or errors to Dr. Heaton.