Why does all the water in a lake have to be cooled to 4C before the surface

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Why does all the water in a lake have to be cooled to 4°C before the surface water can be cooled below 4°C?
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Thermodynamics An Engineering Approach

ISBN: 978-0073398174

8th edition

Authors: Yunus A. Cengel, Michael A. Boles

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