Greenhouse Effect

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Across
  1. 2. Too many gases in Earth's atmosphere causes Earth to become too _____.
  2. 4. gases Types of gases that keep Earth warm.
  3. 5. Day-to-day changes in the atmosphere.
  4. 8. This greenhouse gases' molecular formula is CH4.
  5. 9. Changes in the atmosphere over a long period of time.
  6. 10. Too few gases in Earth's atmosphere causes Earth to become too ______.
Down
  1. 1. dioxide This greenhouse gases' molecular formula is CO2.
  2. 3. What is the purpose of greenhouse gases?
  3. 6. The term for sunlight bouncing back from Earth's surface into space.
  4. 7. vapor This greenhouse gases' molecular formula is H2O.