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tectonic plate
tec·ton·ic plate (plural tec·ton·ic plates)


noun 
Definition:
 
segment of Earth's crust: a segment of the Earth's crust that moves relative to other segments and is characterized by volcanic and seismic activity around its margins
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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