Also known as "geological time", this refers to the period covering the physical formation and development of Earth, especially prior to human history.
Adapted from The American Heritage® Dictionary of the English Language, Fourth Edition

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Comprehending Geological Time
[ Teens/Mature Teens ] An interactive tool to calculate time periods and human history in terms of different measurement scales such as a meter, a day or a million years.
Earth Floor: Geologic Time
[ Teens/Mature Teens ] Explains how the age of the earth is divided up into periods of time, and provides simple definitions and illustrations of the different names.
Fugue No. 16: G Minor
[ Kids/Teens/Mature Teens ] Listen to the music piece while reading about how the geology and ecosystems of Grand Canyon, AZ are like a Bach fugue.
Geologic Time Scale
[ Kids/Teens/Mature Teens ] A simple table of the different time periods contains links to details of the rocks, fossils and locations of each one.
Geological Time Line
[ Teens/Mature Teens ] A simple chart provides links to further details of each era, and an interactive feature allows users to see global shifts and milestones.
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April 9, 2015 at 7:05:15 UTC
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