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Geologists choose a dating method that suits the materials available in their rocks. Measuring isotopes is particularly useful for dating igneous and some metamorphic rock, but not sedimentary rock.

Sedimentary rock is made of particles derived from other rocks, so measuring isotopes would date the original rock material, not the sediments they have ended up in.

These break down over time in a process scientists call radioactive decay.

Each original isotope, called the parent, gradually decays to form a new isotope, called the daughter.

Some measure the decay of isotopes more indirectly.

For example, fission track dating measures the microscopic marks left in crystals by subatomic particles from decaying isotopes.

These use radioactive minerals in rocks as geological clocks.

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

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Geologists often need to know the age of material that they find.

This diet apparently helps to keep dopamine levels much higher than are seen in normal individuals who do not eat berries as a regular part of their diet as they enter their later years.

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