Fact 1: The vanes rotating in an electric fan causes air to move.

Fact 2: Turbines are usually made with a series of curved vanes on a central rotating spindle.

Given the two facts above, answer the question "what part of an electric fan causes air to move?" with the following options: 
- cover
 - mechanism
 - heat energy
 - electrically
 - turbines
 - cycles
 - fan base
 - heat


 

     turbines    