The Earth being tilted on its rotating axis causes seasons, and latitude and season cause temperature variations. Given these facts, what causes yearly temperature variations among the following options:
- earth's rotation
 - scattered light
 - earth's bend on rotating axis
 - exposure to cold
 - depress neuronal excitability
 - earth's tilt on rotating axis
 - wind and erosion
 - earth's tilt on rotating half


 

      earth's tilt on rotating axis   