water has a high specific heat capacity water has a high surface tension water is less dense as a solid than as a liquid water is a polar molecule
I gave my students this multiple choice question: What property of water best helps aquatic life survive in lakes during the winter?

Only one answer is correct among these 4 choices:
- water has a high specific heat capacity
- water has a high surface tension
- water is less dense as a solid than as a liquid
- water is a polar molecule

Could you tell me which one is correct?

water is less dense as a solid than as a liquid