Fact 1: Damming a river can cause a lake to form.

Fact 2: The dam also generates electricity.

Given the two facts above, answer the question "What can cause a lake to form?" with the following options: 
- Something that generates electricity
 - water and minerals
 - rivers and streams
 - fissures of hot, acidic water
 - dividing into two parts
 - it flows to a lower level
 - a hydraulic system
 - changing the phase


 

 Something that generates electricity        