Which statement explains what geologists can learn from the graph?
They can estimate that all the potassium will have decayed within 6.5 billion years.
They can tell that 1/8 of the argon gas will be left after 3.9 billion years.
They can determine that a rock is 1.3 billion years old if 1/2 of the potassium has decayed.
They can see that potassium's half-life varies from every 1.3 billion years to every 5.2 billion years.
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