8th grade Earth History

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Last updated 6:51 PM on 8/27/26
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10 Terms

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Age of Earth

Approximately 4.54 billion years old.

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Radiometric dating

A method used to determine Earth's age by measuring radioactive decay.

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Geologic time

Divided into Eon, Era, Period, and Epoch based on major Earth events.

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Eon

The broadest division of geologic time, spanning billions of years.

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Eras

Subdivisions of eons marked by major changes in life forms.

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Paleozoic Era

Spanning 541 to 252 million years ago, known as the 'Age of Invertebrates & Amphibians'.

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Mass Extinctions

Catastrophic events that erase a large percentage of species and mark boundaries between eras.

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Law of Superposition

In undisturbed sedimentary rock layers, older layers are at the bottom.

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Index Fossils

Fossils used to date rock layers, derived from organisms that were widespread and lived for a short time.

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Cenozoic Era

Last era, started 66 million years ago, characterized as the 'Age of Mammals'.