Erasmus ecology crossword puzzle

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Across
  1. 2. – adjective that refers to something that is not new and has been owned or used by someone else before
  2. 6. – animals or plants that may disappear soon
  3. 7. – the natural world around us
  4. 9. - the act of planting trees on an area of land that has become empty
  5. 10. – things we use from nature (like water, trees, oil)
  6. 13. – the Earth getting hotter
  7. 14. – cutting down too many trees
  8. 16. – energy from the sun, wind, or water
  9. 17. – dirty the environment by releasing harmful chemicals or substances to the air, water, or land
  10. 19. – coal, oil, gas – non-renewable energy sources
  11. 20. – using resources in a way that doesn’t harm the future
Down
  1. 1. – a community of living and non-living things working together
  2. 3. – to make a waste product usable again
  3. 4. – how much carbon dioxide someone produces
  4. 5. – chemicals used to kill pests on crops
  5. 8. – a layer in the sky that protects us from the sun
  6. 11. – the variety of living things in a place
  7. 12. - materials that have no use and are unwanted
  8. 13. – gases that make the Earth warmer
  9. 15. – the natural home of a plant or animal
  10. 18. – good for the environment; synonym of environment-friendly