Fact 1: The Earth revolving around the Sun causes the seasons to change on its axis. Fact 2: Winter is a horrible season. Given the two facts above, what is a cause of the Earth revolving around the Sun?

Select from:
1). heat;
2). wind;
3). winter;
4). Light;
5). Movement;
6). energy;
7). sunlight;
8). Joules;
The answer is:
3).