24. History of Life on Earth
History of Life on Earth
Multiple Choice
Multiple ChoiceA radioactive isotope has a half-life of 1.2 billion years. As measured by the presence of the isotope and its stable decay product, a rock originally contained 10 grams of the radioactive isotope and now contains 1.25 grams. Approximately how many years old is the rock?
A
10,000 years
B
12 billion years
C
0.3 billion years
D
1,000 years
E
3.6 billion years
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