Instead of all of Earth’s geologic history represented as a single year, try laying it out as a length—perhaps in your living room or backyard. Scale it to 10 feet equals 1 billion years, or whatever fits in the space. How far along the line are all human history and all life on land?

Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
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Instead of all of Earth’s geologic history represented as a single year, try laying it out as a length—perhaps in your living room or backyard. Scale it to 10 feet equals 1 billion years, or whatever fits in the space. How far along the line are all human history and all life on land?

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