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

Fact 2: Seasons are caused by the tilt of the axis relative to the planet's orbit.

Given the two facts above, answer the question "What causes a planet's seasons?" with the following options: 
- motion
 - clouds
 - cold
 - climate
 - temperature
 - orbit
 - gravity
 - wind


 

      orbit   