It has a nice surface. It has an interesting shape. It is made of several layers. It feels warm when touched.
I gave my students this multiple choice question: A student observes different characteristics of a rock. Which observation best describes a fact about the rock?

Only one answer is correct among these 4 choices:
- It has a nice surface.
- It has an interesting shape.
- It is made of several layers.
- It feels warm when touched.

Could you tell me which one is correct?

It is made of several layers.