Question

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why does a layer of ice form on the surface of a pond during freezing weather?
molecules of water in the solid phase are less dense than those in the liquid phase.
molecules of water in the solid phase are more dense than those in the liquid phase.
molecules of water in the liquid phase are less cohesive than those in the solid phase.
molecules of water in the liquid phase are more cohesive than those in the solid phase.

Explanation:

Water is a unique substance where its solid - ice - is less dense than its liquid form. When the temperature drops and water freezes, the less - dense ice floats to the surface and forms a layer.

Answer:

Molecules of water in the solid phase are less dense than those in the liquid phase.