Complete the Crossword puzzle

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Across
  1. 3. a damgerous chemical element for the nervous system
  2. 5. a synthetic fabric which is easy to produce
  3. 8. a chemical element found in the plumbing system
  4. 9. a synthetic fabric which takes a lot of time to disintegrate
  5. 12. To breath a material
  6. 13. chemical colours
  7. 14. the natural world effected by human activity
Down
  1. 1. a hole in the ground filled with waste
  2. 2. poisonous, venomous, dangerous
  3. 4. a material which is easy to recycle
  4. 6. putting toxic chemicals in air, soil and water
  5. 7. cotton, silk, wool, linen...
  6. 10. to eat or drink
  7. 11. discarded, no longer useful
  8. 15. to create by hand