This is an informational tour in which students gain a basic understanding of geologic time, the evidence for events in Earth’s history, relative and absolute dating techniques, and the significance of the Geologic Time Scale.
Geologists often need to know the age of material that they find.
These use radioactive minerals in rocks as geological clocks.
This works because elements have a life cycle known as a “half-life.” A half-life refers to the amount of time it takes for an isotope to lose half of its atoms as a result of decaying.
Each isotope is identified with what is called a ‘mass number’.
When ‘parent’ uranium-238 decays, for example, it produces subatomic particles, energy and ‘daughter’ lead-206.
Radiometric dating is often used to determine the age of rocks, bones, and ancient artifacts.
In fact, radiometric dating can be used to determine the age of the Earth, (5.54 billion years old) other planets, and celestial objects.
They use absolute dating methods, sometimes called numerical dating, to give rocks an actual date, or date range, in number of years.
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