Conceptual Physics (12th Edition)

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

Chapter 34 - Think and Discuss: 78

Answer

See below.

Work Step by Step

Radioactivity in the Earth’s interior warms it and keeps it molten, and radioactivity also heats up the water in hot springs and geysers. This is discussed on page 617. The sun is our ultimate source of energy, which itself is powered by fusion. This is discussed on page 652.
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