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seafloor spreading

a process in which new ocean floor is created as molten material from the earth's mantle rises in margins between plates or ridges and spreads out. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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sea floor spreading in Culture

sea floor spreading definition

The process by which new material that lies under the ocean rises and pushes the existing tectonic plates aside, creating new crust as it does so.

Note: Sea floor spreading is making the Atlantic Ocean wider by a few inches each year.
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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