A good index fossil will be

Earth is

Radioactive isotopes are used to date rocks and fossils because

Carbon-14 is a good isotope to use to date fossils and rocks that are

A sample containing 25% Potassium-40 and 75% Argon-40 has gone through

Most of the rocks found in Western New York are from the geologic time period know as

Earth's current atmosphere

When a radioactive isotope decays

When examining layers of rocks, the oldest layer can be found

A fault, folding, tilting, intrusions or extrusions are

An unconformity is

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