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Mass
Mass.
mass
mass balance
mass communication
mass defect
mass-energy equation
mass-energy equivalence
mass extinction
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mass extinction
mass ex·tinc·tion


noun 
Definition:
 
destruction of whole species: the destruction of a whole species by a force of nature such as climate change, volcanic eruption, or asteroid collision, thought by many scientists to have wiped out the dinosaurs
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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