wonderlei wonderlei

07-03-2017
Biology

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What event occurred when the decay of strontium-90 in an igneous rock first started?

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damionjohnson1 damionjohnson1

07-03-2017

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.

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