Fact 1: Earth 's tilt on its rotating axis causes seasons to change.

Fact 2: Spring, summer,autumn and winter are seasons.

Given the two facts above, answer the question "What is caused by Earth 's tilt on its rotating axis?" with the following options: 
- erosion
 - Day and night
 - rainfall
 - Weather
 - wind
 - Gravity
 - Winter
 - flooding


 

       Winter  