Question

If a scientist wants to figure out how old a rock layer is, would it be useful to use a substance that takes a long time to break down (has a long half life), or a substance that breaks down quickly?

A.A substance that breaks down slowly, because then there won't be enough left to measure

B.A substance that breaks down slowly, because then there will be enough left to measure.

C.A substance that breaks down quickly, so it will be all gone and we'll know it's old

Answer 1

Answer:

B.

Explanation:

This is because if it has a long half-life then there will be enough rock left to be able to determine the age of the rock. It is not A. because if it has a long half-life there would be part of the substance left to determine the age. It is not C. because in order to study the substance, there must first be a substance left to study.

Hope this helps!