Select from:
1). kinetic energy.
2). metal face.
3). heat energy.
4). activation energy.
5). Solar energy.
6). plastic buttons.
7). vanes rotating.
8). electric cord.
Q: Fact 1: The vanes rotating in an electric fan causes air to move. Fact 2: Fans move air, providing a cooling breeze. Given the two facts above, what in an electric fan provides a cooling breeze?
A:
7).