Fact 1: The Earth being tilted on its rotating axis causes seasons.

Fact 2: Autumn is a beautiful season.

Given the two facts above, answer the question "What is caused by Earth being tilted on it's axis?" with the following options: 
- friction
 - acceleration
 - climate
 - rainfall
 - slopes
 - wind
 - waves
 - Autumn


 

        Autumn 