Nature

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Across
  1. 2. a space in something, with an opening on one side
  2. 5. Things like water can flow in a long, round thing
  3. 6. with a lot of water
  4. 9. something like air, not liquid or solid
  5. 10. the power from sources such as the sun, water, wind and coal
  6. 12. use waste or chemicals to make rivers and seas dirty
  7. 13. the parts of a tree with leaves, flowers, or fruit on them
  8. 14. You use a kind of white powder from the sea in cooking
  9. 16. You can leave this kind of mark especially when you walk in the sand
  10. 18. The sun gives out bright light
  11. 19. We live on this planet
  12. 20. the surface of the earth
Down
  1. 1. an area to grow crops
  2. 3. Trees produce this kind of air with the help of the sun
  3. 4. an illness
  4. 7. large things such as tables, chairs, or beds
  5. 8. with little water
  6. 11. a very high area of land with steep sides
  7. 15. A thing is picked or produced recently
  8. 17. a part of ground instead of sea or ocean