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The atoms of some chemical elements have different forms, called isotopes.

Isotopes are important to geologists because each radioactive element decays at a constant rate, which is unique to that element.

Since the 1950s, geologists have used radioactive elements as natural "clocks" for determining numerical ages of certain types of rocks. "Forms" means the moment an igneous rock solidifies from magma, a sedimentary rock layer is deposited, or a rock heated by metamorphism cools off.

It's this resetting process that gives us the ability to date rocks that formed at different times in earth history.

Radioactive elements were incorporated into the Earth when the Solar System formed.

All rocks and minerals contain tiny amounts of these radioactive elements.

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