The distance between Earth and the Sun is increasing. The tilt of Earth on its axis is constantly changing. Earth is revolving around the Sun. Earth is rotating on its axis.
I gave my students this multiple choice question: Jessica watches the Sun set in the evening sky. What causes the setting of the Sun?

Only one answer is correct among these 4 choices:
- The distance between Earth and the Sun is increasing.
- The tilt of Earth on its axis is constantly changing.
- Earth is revolving around the Sun.
- Earth is rotating on its axis.

Could you tell me which one is correct?

Earth is rotating on its axis.