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seafloor spreading
sea·floor spread·ing


noun 
Definition:
 
creation of new seafloor: a process in which molten material from the Earth's mantle rises up at ocean ridges, causing volcanic and seismic activity, spreads out, and creates a new seafloor
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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