environmental issues

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Across
  1. 3. rubbish such as paper, cans, and bottles left lying in an open or public place.
  2. 5. an overflow of a large amount of water beyond its normal limits, especially over what is normally dry land.
  3. 6. a distinct compound or substance, especially one which has been artificially prepared or purified.
  4. 8. a chemical or natural substance added to soil or land to increase its fertility
  5. 9. (of a species, family, or other group of animals or plants) having no living members; no longer in existence.
  6. 10. unwanted or unusable material, substances, or by-products
Down
  1. 1. the action of clearing a wide area of trees.
  2. 2. convert (waste) into reusable material.
  3. 4. the presence in or introduction into the environment of a substance which has harmful or poisonous effects.
  4. 7. a substance used for destroying insects or other organisms harmful to cultivated plants or to animals.