At first you have to write the variables out which are

now you have to combine like terms


now you add these two variables and end up with answer of
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ANSWER:</h2>
<u><em>If you have found a radiometric age for the surrounding layers of volcanic ash, you can say that the age of the intervening layer is halfway between those specific dates.</em></u>
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Explanation:
It evaporates from the earth surface, condenses into clouds, and falls back to earth as rain or snow.
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Igeneous intrustions are created when magma that is trying to get out from under the earth, cools before it reaches the surface and causes geological irregularities. there are 3 types of igeneous intrusions: sills, batholiths, and dykes.