Vocabulary

5. a machine which uses air gas water or stream to turn a wheel and produce power
7. to keep something within strict limits
8. the process by which the surface of land or rock is gradually destroyed by the action of water, wind, rain, etc
9. to become or cause something to become smaller or weaker
10. a barrier built across a river to stop the water from flowing usually to create a lake or to produce electricity
12. the cables used to carry electricity over long distances
14. to get rid of something that you no longer need or want
15. the energy an object has as a result of movement
16. used to describe two or more lines that are the same distance apart at every point

1. part(s) of an engine that concert power into movement
2. mainly or mostly
3. using methods that do not harm the environment, and can therefore continue for a long time
4. to mention something as an example explanation or proof of something
6. the continuous movement of a liquid in one direction
11. a machine that proces electrycity
13. a long narrow passage that people or liquids gasses ect. can move through