Solve the problems below. To make calculations easier,
Chapter 11, Problem 5(choose chapter or problem)
Solve the problems below. To make calculations easier, round the age of Earth to 5 billion years. a. What percentage of geologic time is represented by recorded history? (Assume 5,000 years for the length of recorded history.) b. Human-like ancestors (hominids) have been around for roughly 5 million years. What percentage of geologic time is represented by the existence of the ancestors? c. The first abundant fossil evidence does not appear until the beginning of the Cambrian period, about 540 million years ago. What percentage of geologic time is represented by abundant fossil evidence?
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