Water is a liquid at room temperature. Water can contain different minerals. Water expands when it freezes. Water dissolves many chemicals.
I gave my students this multiple choice question: Water is a very important part of the physical weathering of rock. Which of these properties of water is most important in causing some of the physical weathering of rock?

Only one answer is correct among these 4 choices:
- Water is a liquid at room temperature.
- Water can contain different minerals.
- Water expands when it freezes.
- Water dissolves many chemicals.

Could you tell me which one is correct?

Water expands when it freezes.