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

Fact 2: Winter followed by summer are the slower seasons.

Given the two facts above, answer the question "what changes from earth's tilt on its rotating axis?" with the following options: 
- h2o
 - temperature
 - rays or beams
 - winter and summer
 - density
 - dry conditions
 - gravity
 - population movement


 

    winter and summer     