Comprehending Geologic Time
http://www.athro.com/geo/hgfr1.html


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This online calculator helps students understand the classic analogy of relating the geologic time scale to a yard stick. It will help reinforce the concept of the briefness of human history relative to the age of the Earth.

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Grade Level: High School (9-12)Keywords: Mass extinctions, Invasions of land, Faunas, Continental plates, Origin of life