Quantcast
Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Medical
  • Scrabble
  • Spanish Central
  • Learner's Dictionary

seafloor spreading

noun

Definition of seafloor spreading

  1. :  the divergence at mid-ocean ridges of the tectonic plates underlying the oceans that is due to upwelling from the earth's interior of magma which solidifies and adds to the spreading plates



1969

First Known Use of seafloor spreading

1969


Seen and Heard

What made you want to look up seafloor spreading? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

to eat gluttonously or ravenously

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

image1926873504

Which of the following best describes an easily irritated person?

flashy tetchy superficial gregarious
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ