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seafloor spreading

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noun
  1. 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.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
sea floor spreading in Culture

sea floor spreading

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 New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.