The environment

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Across
  1. 2. official rules that saw what people are allowed and not allowed to do
  2. 4. change from solid to liquid, for example, from ice to water
  3. 8. a large amount of water covering an area that is usually dry
  4. 9. not existing anymore
  5. 10. waste materials or things that are no longer wanted or needed
Down
  1. 1. things that make water, air, and ground unclean
  2. 3. air pollution caused by smoke or chemicals mixing with fog
  3. 5. to drop rubbish on the ground in a public place
  4. 6. material that people throw away
  5. 7. the activities of treating materials or products using a special industrial process so that they can be used again