Across
- 2. a gas with no smell or colour,it is needed by animals and plants to live
- 7. a mountain or hill which has a crater through which a lava comes out
- 8. the presence of harmful and dangerous substances
- 9. animals that can die out
- 11. a steep rock face (very often near the sea)
- 12. a small, narrow river
- 13. rubbish, garbage
Down
- 1. this is where the river falls from a higher point to a lower point
- 3. the Earth is our . . .
- 4. a low area between hills or mountains
- 5. it is a hot place with lots of trees and animals
- 6. it is a big hole in the mountain or under the ground
- 10. CO2 = carbon . . .