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