Earth day

3. number and variety of plant and animal species in a particular area.
6. unwanted matter or material of any type; trash.
7. resources things such as minerals, forests, coal, etc. which exist in a place and can be used by people.
8. energy it can be produced as quickly as it is used.
9. the process by which land changes into desert.
11. rain it contains large amounts of harmful chemicals as a result of burning substances such as coal and oil.
15. damage caused to water, air or soil by harmful substances or waste.
18. a mountain with a large circular hole at the top through which lava gases, steam and dust are or have been forced out.
19. it decays naturally .

1. the cutting down of trees in a large area.
2. product an article that is intended to be thrown away after use.
4. species animals or plants which may soon not exist because there are very few now alive.
5. general weather conditiones useally found in a particular place.
10. to collect and treat rubbish to produce useful materials which can be used again.
12. an extremely large wave caused by movement of the earth under the sea, often caused by an earthquake.
13. warming a gradual increase in world temperatures caused by polluting gases such as carbon dioxide which are collecting in the air around the Earth and preventing heat escaping into space.
14. layer it prevent harmful ultraviolet light from the sun from reaching the Earth.
16. strong, unpleasant and sometimes dangerour gas; smoke.
17. monoxide poisonous gas.
20. spill it covers a large area of the surface of the sea, usually because an accident has caused it to escape from ship or container.