Conceptual Physics (12th Edition)

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

Chapter 15 - Think and Explain: 74

Answer

The water cools and shrinks the outer shell of the boulders while the insides remain hot and expanded. The outer layer fractures. (This can be likened to wearing a piece of clothing that suddenly shrinks. )
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