Across
- 3. gases and other substances
- 6. the gradual destruction or diminution of something
- 7. What energy sources are wind and sun?
- 9. the gas which has a major role in the Greenhouse Effect is
- 10. illegal hunting
- 11. area of farming land or woods and parks which surrounds a town
- 12. if smoke reacts with industrial fog, what will be formed?
Down
- 1. made dirty by something being added to it
- 2. animals living and plants growing in their natural environment
- 4. rubbish or garbage from a house or apartment
- 5. the contamination of the enviroment
- 8. the action of clearing a wide area of trees