The crossword of Nature

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Across
  1. 4. Large body of salty water
  2. 5. A large area with many trees
  3. 7. Energy from sun
  4. 9. Power we use for heat, light or movement
  5. 11. Liquid that rivers, lakes and seas are made of.
  6. 12. To make the air, water or land dirty.
Down
  1. 1. To turn old materials into something new.
  2. 2. Natural world: plants and animals
  3. 3. Colour linked to envoronment
  4. 6. Gas we breathe
  5. 8. To use something again instead of throwing it
  6. 10. The planet we live on