Crash Course: History of Science: Crash Course History of Science
01:07 - 06:38
5m 31s
geohistory
earth's timeline
earth history

John Green explains how historians have determined the age of the Earth. He mentions that they created a quantitative chronology of human history by using ancient documents and events. He also states that various thinkers throughout history have used fossils and rocks to determine the Earth's actual age.

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