Conceptual Physics (12th Edition)

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

Chapter 16 - Think and Explain: 75

Answer

For rocks at the Earth’s surface, the energy generated by trace amounts of radioactive minerals quickly transfers to the cooler surroundings. Deep in the interior, such rocks are surrounded by other rocks, and the energy builds up.
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