tilt of Earth on its axis rotation of Earth on its axis revolution of Earth around the Sun revolution of the Moon around Earth
I gave my students this multiple choice question: Liam lives in the Northern Hemisphere of Earth and plays in the snow in December. His friend lives in the Southern Hemisphere of Earth and plays at the beach in December. What is the best explanation for why this is possible?

Only one answer is correct among these 4 choices:
- tilt of Earth on its axis
- rotation of Earth on its axis
- revolution of Earth around the Sun
- revolution of the Moon around Earth

Could you tell me which one is correct?

tilt of Earth on its axis