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rock flour

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glacial meal

–noun
finely ground rock material produced by the grinding action of a glacier on its bed.
Also called glacier meal, rock flour.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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rock flour  
n.  Finely ground rock particles produced by glacial abrasion. Also called glacier meal.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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