by alyssa


1. dams are very expensive to build and they must be good and high quality

2.it can also over flow and ruin the enviorment

3. and do to the high coast means that it can take decades to build a dam


1. better than buring coal so it wont pollute the air

2. hydropower it is renwable

3.coal minning can harm some of the workers that work in coal mines but hydropower does not