Origin of metamorphic
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for metamorphic
The rocks of these ranges are primary and metamorphic, and the scenery is bold.A Tramp's Notebook
In metamorphic rocks the difficulties are usually about as great.Geology
William J. Miller
Crude petroleum is never found in metamorphic or igneous rocks.The A B C of Mining
Charles A. Bramble
When they present these characteristics, we term them Metamorphic Rocks.The World Before the Deluge
The Metamorphic strata, why less calcareous than the fossiliferous.A Manual of Elementary Geology
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
Word Origin and History for metamorphic
Online Etymology Dictionary, © 2010 Douglas Harper
- Zoology Relating to metamorphosis.
- Geology Relating to rocks that have undergone metamorphism. Metamorphic rocks are formed when igneous, sedimentary, or other metamorphic rocks undergo a physical change due to extreme heat and pressure. These changes often produce folded layers or banding in the rocks, and they can also cause pockets of precious minerals to form. The folds and banding can be produced by incomplete segregation of minerals during recrystallization, or they can be inherited from preexisting beds in sedimentary rocks or preexisting layers in igneous rocks. The precious minerals can form as the result of recrystallization when the rocks undergoing metamorphism are subjected to changes in pressure and temperature.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.