3
QuizMultiple Choice
Absolute Dating
Question 3 • IN-Earth and Space Science A
The graph shows calculations for potassium-argon dating.
Answer
A
They can estimate that all the potassium will have decayed within 6.5 billion years.B
They can tell that 1/8 of the argon gas will be left after 3.9 billion years.C
They can determine that a rock is 1.3 billion years old if 1/2 of the potassium has decayed.D
They can see that potassium’s half-life varies from every 1.3 billion years to every 5.2 billion years.