Answer
Because there is less dense air, and lower pressure above, faster-moving air molecules migrate upward, starting convection currents.
Work Step by Step
This is discussed on pages 305-306.
Conceptual Physics (12th Edition)
by Hewitt, Paul G.
Published by
Addison-Wesley
ISBN 10:
0321909100
ISBN 13:
978-0-32190-910-7
Chapter 16 - Think and Explain - Page 317-318: 64
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