Earth is a sphere. Earth supports life. Earth has a layered atmosphere. Earth is covered mostly with water.
I gave my students this multiple choice question: The changing appearances of the nighttime sky over the surface of Earth and eclipses of the Moon have provided evidence that

Only one answer is correct among these 4 choices:
- Earth is a sphere.
- Earth supports life.
- Earth has a layered atmosphere.
- Earth is covered mostly with water.

Could you tell me which one is correct?

Earth is a sphere.