Environment & Ecology

3. The natural home of a plant or animal
4. The process in which fertile soil is gradually removed by wind or water
6. The cutting down of large areas of forest
7. To move from one region to another, usually according to the season
10. A large amount of snow falling within a short period of time
13. A gas released when fossil fuels are burned that contributes to global warming
14. The gradual increase in the Earth's average temperature over time
17. A type of fuel produced from plants or other biological materials
18. A tall structure with large blades that uses moving air to produce electricity
19. A storm with thunder, lightning, strong winds and heavy rain

1. Fuels such as coal, oil and natural gas formed from ancient organic matter
2. A huge wave caused by an underwater earthquake or volcanic eruption
3. A strong tropical storm with very powerful winds and heavy rain
5. A plant or animal that is at risk of disappearing forever
8. A situation in which there is very little or no rain for a long time
9. A period of extremely high temperatures that lasts for several days or weeks
11. A place where rubbish is buried or stored
12. Energy produced from sources that do not run out, such as sunlight, wind or water
15. The variety of plants and animals living in a particular area
16. A measure of the amount of greenhouse gases produced by a person, company or activity