Unit 6 earth forces relative dating

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Realizing that these ancient organisms are some of the first with hard parts, and (when taken as a group) are not very similar to animal communities living today, in which unit of geologic time would you place these rocks? How many years have the mountains and rivers existed? You can find the answers to these questions using radiometric dating.

Geologists and archeologists have found the age of rocks, minerals, fossils, and ancient remains using radioactive isotopes.

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Unlike relative time, absolute time assigns specific ages to events or formations and is typically recorded in years before present.

The first step in this process is to assess the type of radioactive decay that is occurring.

Although some isotopes are stable, others are unstable because the forces binding protons and neutrons together are not so strong.

By combining knowledge gained using both relative and absolute dating processes geologists have been able to produce the geologic time scale.

Geologists study the natural history of an area by investigating outcrops, which are rock formations exposed aboveground.

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