Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Chapter 15 - Reading Check Questions (Comprehension): 30

Answer

When surface water is cooled to $4^{\circ} C$ it is at its densest, and sinks downward, to be replaced by warmer water. Only when all of the lake water reaches $4^{\circ} C$, and is as dense as the surface water, does surface water remain there to freeze.

Work Step by Step

This is discussed on page 296, and shown in Figure 15.23.
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