You are presented with the question "what causes seasons?" and the following answer choices: 
- moon
 - decreased differentiation
 - earth's revolving
 - the ocean
 - Physical weathering
 - colors of the spectrum
 - gravity
 - dry conditions

Now knowing that the Earth revolving around the Sun causes the seasons to change on its axis and seasons are caused because the earth's axis is tilted as the earth revolves around the sun, choose the best answer.


 

   earth's revolving      