Question

Are only sedimentary rocks used for relative age determination? Why?

Answer 1

Determining the Relative Age of Rocks. The Law of Superposition states that in undisturbed sedimentary rock layers, younger rocks are on the top while older rocks are on the bottom. However, forces such as folding, faulting and uplifting can rearrange the rock layers so the youngest is not always found on top.

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Answer 2

because it has both parent and radioactive isotopes of carbon through which their age is predicted.