Climate Change

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Across
  1. 3. ___ energy: direct energy from the sun
  2. 5. ___ dioxide is what we exhale
  3. 6. historical evidence like ___ can help us to see what climate was like in a particular place at a particular time
  4. 9. cutting trees down
  5. 10. the ___ effect
  6. 11. ___ fuels - we burn these to create energy
Down
  1. 1. the average weather over a long period of time, usually 30 years
  2. 2. the mixture of gases surrounding the Earth
  3. 4. the process that occurs in living green plants where carbon dioxide is converted to oxygen
  4. 7. ___ rings can be used to tell how warm/cold climate was over time
  5. 8. the greenhouse gas that comes from organisms, eg. cow's flatulence