science

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Across
  1. 4. the level that water goes to in the ocean
  2. 6. long and short wave
  3. 8. the place where the ozone is
  4. 9. the first layer of the lithosphere
  5. 10. when the globe gets too cold and freezes
  6. 11. the carbon cycle is described as a
  7. 13. where all the gases are
Down
  1. 1. carbon dioxide methane
  2. 2. comes from cows
  3. 3. one of the biggest natural sources of carbon
  4. 5. when a forest burns
  5. 7. the effect of a thing
  6. 9. a fossil fuel
  7. 12. dioxide