divergent plate boundary

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di·ver·gent plate boundary

A tectonic boundary where two plates are moving away from each other and new crust is forming from magma that rises to the Earth's surface between the two plates. Also called spreading zone. See more at tectonic boundary. Compare convergent plate boundary.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
References in periodicals archive ?
Also, there are examples where the speeds of plates either side of a divergent boundary are very different.
Iceland is one of the few cases of a mantle thermal plume adding more heat and much more melting to a divergent boundary.