Answer
b. 225,000 years
Work Step by Step
Half life of Thorium = 75,000 years
Time to decay 7/8 of Thorium = 75,000 x 3 = 225,000 years
Biology 2010 Student Edition
by Miller, Kenneth R.; Levine, Joseph S.
Published by
Prentice Hall
ISBN 10:
9780133669510
ISBN 13:
978-0-13366-951-0
Chapter 19, History of Life - Standardized Test Prep - Page 569: 6
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