diatreme

[dahy-uh-treem]

di·a·treme

[dahy-uh-treem]
noun Geology.
a volcanic vent produced in a solid rock structure by the explosive energy of gases in magmas.

Origin:
1930–35; dia- + Greek trêma hole
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Diatreme is always a great word to know.
So is loam. Does it mean:
thin, distinctive stratum useful for stratigraphic correlation
rich soil containing a relatively equal mixture of sand, silt and a smaller proportion of clay
American Heritage
Science Dictionary
diatreme   (dī'ə-trēm')  Pronunciation Key 
A volcanic pipe, filled with breccia, formed by a subterranean gaseous explosion. See illustration at batholith.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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