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mid
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mid-ocean ridge
mid-o·cean ridge (plural mid-o·cean ridges)


noun 
Definition:
 
undersea mountain range: a long underwater mountain range of the Atlantic, Indian, or South Pacific oceans formed from volcanic rock released during the movement of tectonic plates
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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