Why Does Ice Form at the Surface of a Body

question 58

Multiple Choice

Why does ice form at the surface of a body of fresh water instead of at the bottom?

• A)Initial freezing requires the presence of air in order to form the ice lattice, thus the surface water will become solid first.
• B)Intermolecular forces are greater at the surface allowing the surface molecules to form the solid phase more quickly.
• C)Water "near" the freezing point of 0°C is less dense than warmer water, and the colder water will "float" on the warmer water. This allows ice to form at the surface.
• D)All of the above are true.

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