Environment

1. A system formed by organisms in interaction with their environment.
4. A structure that looks like a bridge and that is used to carry water over a valley
6. Using resources in a way that maintains their availability for future generations.
7. conversion of energy from sunlight into electricity
9. A system in which waste materials are buried under the ground
11. Relating to or using the natural heat produced inside the Earth
13. A science that deals with the relationships between groups of living things and their environments
14. Used to describe a type of animal or plant that has become very rare and that could die out completely

2. Thick, soft, wet mud
3. The existence of many different kinds of plants and animals in an environment
5. The clearing of trees from a forested area for other uses.
8. The whole mass of air that surrounds the Earth
10. To be slowly destroyed by natural processes
12. An underground layer of water-bearing rock or sediment.