The length of recorded history for humankind is about 5000...

Name: Problem 1, Chapter 1: Essentials of Geology
Uploaded: 2021-07-17T20:41:50-08:00
Duration: 1 min 49 s
Channel: Sakib Sarker
Description: The length of recorded history for humankind is about 5000 years. Clearly, most people view this span as being very long. How does it compare to the length of geologic time? Calculate the percentage or fraction of geologic time that is represented by recorded history. To make calculations easier, round the age of Earth to the nearest billion.

The length of recorded history for humankind is about 5000 years. Clearly, most people view this span as being very long. How does it compare to the length of geologic time? Calculate the percentage or fraction of geologic time that is represented by recorded history. To make calculations easier, round the age of Earth to the nearest billion.

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Key Concepts

Recorded History

Recorded history refers to the brief time span during which human activities have been documented through written records, artifacts, and other means. It typically covers about 5,000 years, representing the period where human societies have maintained a historical record.

Geologic Time

Geologic time is the extensive scale that encompasses the age of the Earth and the evolution of its geological features over billions of years. It is divided into eons, eras, periods, and epochs, providing a framework for understanding the long-term history of the planet.

Scale Comparison

Comparing recorded history and geologic time involves understanding the vast difference in their durations. By using basic arithmetic to form a ratio or percentage, we can express the small fraction of Earth's history that recorded human events represent, illustrating the immense scale of geologic time.

Rounding for Approximation

Rounding, in this context, is used to simplify the Earth's age to the nearest billion for ease of calculation. This approximation technique allows for a straightforward estimation of the proportion of geologic time that recorded human history occupies.

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