Air is a mixture of gases. Ice is a mixture of gases. Air is a liquid. Ice is a liquid.
I gave my students this multiple choice question: Which statement correctly describes a property of a type of matter?

Only one answer is correct among these 4 choices:
- Air is a mixture of gases.
- Ice is a mixture of gases.
- Air is a liquid.
- Ice is a liquid.

Could you tell me which one is correct?

Air is a mixture of gases.