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If the following graph represents the decay of strontium-90 in an igneous rock, what event occurred at 0 years on the horizontal axis?

I have a graph with the vertical axis showing the percentage of radioactive element remaining. The values on the vertical axis are 0 (intersecting), 25, 50, 75, and 100. The values on the horizontal axis are 0 (intersecting), 28, 56, 84, and 112. The actual data values are (28,50), (56,25), (84, 12.5), and (112, 6.25). Is the event the formation of the rock?

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    I don't understand I need help with this

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    I also have the same question. Please let me know if you get the answer.

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    Please help me too. I have the same quiz as you Nicole M. I really need help

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    If anyone finds the answer, please let me know. I have the same question.

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