It will melt to form liquid water. It will melt to form water vapor. It will freeze to form liquid water. It will not change at all.
I gave my students this multiple choice question: A large piece of ice is placed on the sidewalk on a warm day. What will happen to the ice?

Only one answer is correct among these 4 choices:
- It will melt to form liquid water.
- It will melt to form water vapor.
- It will freeze to form liquid water.
- It will not change at all.

Could you tell me which one is correct?

It will melt to form liquid water.