To date a sedimentary rock layer between two igneous rock units, gologists use
radiometric dating and assume that the sedimentary layer's age

that is a good question here is the explanation :)

Explanation: The universe is full of naturally occurring radioactive elements. Radioactive atoms are inherently unstable; over time, radioactive "parent atoms" decay into stable "daughter atoms."

When molten rock cools, forming what are called igneous rocks, radioactive atoms are trapped inside. Afterwards, they decay at a predictable rate. By measuring the quantity of unstable atoms left in a rock and comparing it to the quantity of stable daughter atoms in the rock, scientists can estimate the amount of time that has passed since that rock formed.

punctuation and every thing :0

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