9 Grammatical Pitfalls

rock flour

Origin of rock flour
1880-85 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for rock flour
  • The glaciers in the background grind the rocks underneath as they melt in the summer and produce rock flour.
  • We also learned the secret of the mountain lakes' brilliant turquoise color: a substance called rock flour.
  • It is found beneath old swamps, as mud on the bottom of the sea, and as the ground-up rock flour left by melting glaciers.
  • Rock debris is crushed and ground into fine grains, called rock flour.
  • The glacial materials near the dam range in size from rock flour to boulders.
  • Remove dust and rock flour residue from concrete slab with compressed air.
British Dictionary definitions for rock flour

rock flour

very finely powdered rock, produced when rocks are ground together (as along the faces of a moving fault or during the motion of glaciers) and are thus chemically unweathered
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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