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geologic time
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geologic time timeline of Earth's history Grand Canyon rock layering marine family diversity Plumb the depths of geologic time. major evolutionary events
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Cross section of Earth showing the core, mantle, and crust
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geologic time: Facts & Related Content

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Facts

Also Known As geological time scale

Photos

geologic time
timeline of Earth's history
Grand Canyon rock layering
marine family diversity
major evolutionary events
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Related Topics and References

Topics
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Related Quizzes and Features

Quiz
Pangaea (Pangea) was a supercontinent 225 million years ago formed by plate tectonics and continental drift.
Name That Geologic Interval
Encyclopaedia Britannica thistle graphic to be used with a Mendel/Consumer quiz in place of a photograph.
36 Questions from Britannica’s Most Popular Science Quizzes
Cross section of Earth showing the core, mantle, and crust
Everything Earth