Across
- 4. to be thrown away after use
- 7. capable of decomposing naturally
- 9. a large wave caused by an earthquake under the sea
- 11. able to reproduce
- 13. species which may soon become extinct
- 14. strong, unpleasant, dangerous gas
Down
- 1. damage caused to water, air or soil
- 2. a mountain with a hole at its top
- 3. a process by which land changes into desert
- 5. plants and animals in a particular area
- 6. cutting down of a lot of trees
- 8. general weather conditions of a given place
- 10. produce useful materials from rubbish
- 12. unwanted things