Question

What property of water allows fish to survive in a lake that is frozen over?

Answer 1

You are probably talking about the fact that frozen water (ice) is less dense than liquid water, so freezing temperatures will enable the ice to form on top of the water body, but still allowing liquid water underneath so fish can survive. Also, ice is usually translucent, so it can still penetrate the ice,allowing algae to continue to photosynthesize, providing oxygen for the fish below. The property you are looking for is solid or ice.

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Answer 2

Ice is less dense than liquid water so it floats. Because of this, bodies of water freeze at the surface. This property allows fish living in lakes and ponds to survive the winter.