Ecology

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Across
  1. 3. chemicals used to make plants and vegetables grow faster
  2. 7. development which does not completely use up or destroy natural resources
  3. 9. a synonym of ecological
  4. 10. If they disappear, the fish can no longer live
  5. 11. you can get electricity from this natural source of energy
  6. 12. a fossile source of energy that we use for our cars
  7. 14. gases which warm the atmosphere of the earth
Down
  1. 1. the act or result of cutting down or burning all the trees in an area
  2. 2. the worst pollution for the seas and oceans
  3. 4. the opposite of fossile
  4. 5. a fossile source of energy whose colour is black
  5. 6. a gas which comes from cars and industries and which pollutes the earth
  6. 8. they can produce geothermal energy
  7. 13. not used in green agriculture