Answer
$4^{\circ}C$.
Work Step by Step
On page 296 it is explained that because of water's high specific heat capacity and poor heat conductance, the bottom of a deep body of water in a cold region remains at $4^{\circ}C$.
Conceptual Physics (12th Edition)
by Hewitt, Paul G.
Published by
Addison-Wesley
ISBN 10:
0321909100
ISBN 13:
978-0-32190-910-7
Chapter 15 - Think and Explain - Page 299-300: 88
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