Earth: An Introduction to Physical Geology (12th Edition)

Published by Pearson
ISBN 10: 0134074254
ISBN 13: 978-0-13407-425-2

Chapter 2 - Section 2.5 - Divergent Plate Boundaries and Seafloor Spreading - Concept Checks - Page 49: 2

Answer

5 cm (about 2 inches) a year.

Work Step by Step

It is about the same rate that your fingernails grow! The East Pacific ridge, however, can have spread rates of more than 15cm annually. Yet the Mid-Atlantic Ridge can grow as slowly as 2 cm annually.
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