2. Dams Dams trap water along rivers. The water turns a turbine which makes electricity. The water is then released through a hole in the dam.

3. Advantages Dams don’t make very much pollution.

4. Advantages doesn't cost much money after the dam has been built.

5. Advantages Works well in places with lots of water.

6. Advantages When dams are made it can improve landscape or leisure.

7. Disadvantages The lake created by a dam takes up lots of space. Some people think they spoil the landscape. The lake can flood farmland.

8. Disadvantages Costs a lot to build. For example, the Three Gorges Dam in China cost US$100 billion.

9. Disadvantages The water can be diverted to another place. There is a big problem when two countries share a river.

10. Disadvantages Dams can cause dirty water and pollution. In tropical places this can cause disease.