As the surface of a lake begins to freeze on a cold night, what is the temperature of the water at the very bottom of the lake?

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1. As the surface of a lake begins to freeze on a cold night, what is the temperature of the water at the very bottom of the lake?

0°C

−1°C

1°C

Approximately 4°C

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Water is densest at about 4°C, not at its freezing point. As surface water cools and eventually freezes, the densest, 4°C water sinks and settles at the bottom.