Horizons: Exploring the Universe (MindTap Course List)
Horizons: Exploring the Universe (MindTap Course List)
14th Edition
ISBN: 9781305960961
Author: Michael A. Seeds, Dana Backman
Publisher: Cengage Learning
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Chapter 16, Problem 5P
To determine

The age of Grand Canyon as a percent of Earth’s age.

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If the Atlantic sea floor is spreading at 3.0 cm/yr and is now 6400 km wide, how long ago were the continents in contact? How does that time span compare to the age of the Earth?
If the Atlantic seafloor is spreading at 2.9 cm/year and is now 6,350 km wide, how long ago (in years) were the continents in contact?  .......yr How does that time span compare to the age of Earth? (Enter your answer as a fraction of Earth's age.)
A chain of undersea volcanoes has a length of 7,400 km today and the first volcano formed 53 million years ago. How fast is the plate moving each year? (Enter your answer in cm/yr.)
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