When a hemisphere is tilted away from the sun , that hemisphere receives less direct sunlight, and because of this tilt, the northern hemisphere receives less direct sunlight (creating winter) while the southern hemisphere receives more direct sunlight (creating summer). Given these facts, what creates winter among the following options:
- Slowing the transfer of heat
 - ice expanding in rock openings
 - earth spinning on its axis
 - earth revolves around the sun
 - a hemisphere is tilted toward the sun
 - a hemisphere is tilted away from the sun
 - lack of moisture in the air
 - mechanical weathering


 

      a hemisphere is tilted away from the sun   