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pillow lava

noun, Geology
lava in the form of an agglomeration of rounded, pillow-shaped masses, the result of subaqueous or subglacial volcanic eruption.
Origin of pillow lava
1900-05 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for pillow lava
  • Pillow flows are produced by the piling up of individual pillow lava lobes.
  • pillow lava is produced when hot, fluid basaltic lava erupts under water.
  • pillow lava, a type of lava found in some of the rocks, is evidence that much of the volcanic action took place underwater.
  • Lobate and pillow lava flows are formed during lower eruption rate, which allows the seawater to cool and harden the lava faster.
  • Volcanic rocks are commonly pillow lava, are vesicular, and weather to shades of red and purple.
British Dictionary definitions for pillow lava

pillow lava

lava that has solidified under water, having a characteristic structure comprising a series of close-fitting pillow-shaped masses
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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pillow lava in Science
pillow lava
Lava that forms from an underwater eruption and is characterized by pillow-shaped masses. Pillow lava forms when hot lava is suddenly exposed to cold water, forming a sacklike membrane that is filled with additional cooling and solidifying lava. The outer membrane is usually finer grained than the inner lava.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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