Solve the problems below that relate to the magnitude of Earth history. To make calculations easier, round Earth’s age to 5 billion years. a. What percentage of geologic time is represented by recorded history? (Assume 5000 years for the length of recorded history.) b. Humanlike ancestors (hominins) have been around for roughly 5 million years. What percentage of geologic time is represented by these ancestors? c. The first abundant fossil evidence for multicellular organisms does not appear until the beginning of the Cambrian period, about 540 million years ago. What percentage of geologic time is represented by this abundant fossil evidence?
Solve the problems below that relate to the magnitude of Earth history. To make calculations easier, round Earth’s age to 5 billion years. a. What percentage of geologic time is represented by recorded history? (Assume 5000 years for the length of recorded history.) b. Humanlike ancestors (hominins) have been around for roughly 5 million years. What percentage of geologic time is represented by these ancestors? c. The first abundant fossil evidence for multicellular organisms does not appear until the beginning of the Cambrian period, about 540 million years ago. What percentage of geologic time is represented by this abundant fossil evidence?
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
Section: Chapter Questions
Problem 1LR
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| Solve the problems below that relate to the magnitude of Earth history. To make calculations easier, round Earth’s age to 5 billion years. a. What percentage of geologic time is represented by recorded history? (Assume 5000 years for the length of recorded history.) b. Humanlike ancestors (hominins) have been around for roughly 5 million years. What percentage of geologic time is represented by these ancestors? c. The first abundant fossil evidence for multicellular organisms does not appear until the beginning of the Cambrian period, about 540 million years ago. What percentage of geologic time is represented by this abundant fossil evidence? |
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