Volcanic rocks

Definitions

  • Webster's Revised Unabridged Dictionary
    • Volcanic rocks rocks which have been produced from the discharges of volcanic matter, as the various kinds of basalt, trachyte, scoria, obsidian, etc., whether compact, scoriaceous, or vitreous.
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Chambers's Twentieth Century Dictionary
    • Volcanic rocks those formed by volcanic agency
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Etymology

Chambers's Twentieth Century Dictionary
It. volcano—L. Volcanus, Vulcanus, god of fire.

Usage

In literature:

Volcanic rocks could not be cut with the continuity and regularity of limestone.
"Manual Of Egyptian Archaeology And Guide To The Study Of Antiquities In Egypt" by Gaston Camille Charles Maspero
Volcanic hills reported to exist near the Endaw Gyee, but no salt rock occurs.
"Journals of Travels in Assam, Burma, Bhootan, Afghanistan and TheNeighbouring Countries" by William Griffith
In the Mediterranean obsidian, a volcanic rock, occasionally took the place of flint, especially in Sardinia and Pantelleria.
"Rough Stone Monuments and Their Builders" by T. Eric Peet
The world about was one of rocks and treeless ridges, spewed from some vast volcanic forge of ages past.
"The Furnace of Gold" by Philip Verrill Mighels
It is produced, as I believe, from the wear and tear of volcanic rocks, and must come from the coast of Africa.
"Chambers's Edinburgh Journal, No. 432" by Various
These volcanic rocks are of undoubted Tertiary origin, say the geologists.
"Round About the Carpathians" by Andrew F. Crosse
Aci Castello should be visited, and those strange rocks, called the Ciclopidi, forced by volcanic pressure from beneath the waves.
"Sketches and Studies in Italy and Greece, Vol III." by John Symonds
Aci Castello should be visited, and those strange rocks, called the Ciclopidi, forced by volcanic pressure from beneath the waves.
"Sketches and Studies in Italy and Greece, Complete" by John Symonds
A boat-shaped implement of speckled volcanic rock, 3 inches long, 1 inch wide, and three-fourths of an inch thick at the middle part.
"Illustrated Catalogue of a Portion of the Collections Made" by William H. Holmes
A volcanic rock in the centre of the ocean.
"Blackwood's Edinburgh Magazine, Volume 60, No. 369, July 1846" by Various
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In news:

When thinking of the Aleutian Islands, the image that usually emerges is one of muted shades: Black volcanic rock, darkened sea water, frequently gray skies, soft green ground cover, white snow and that's about it.
In Case of Fire, Grab Cat, Passport and Hunk of Volcanic Rock.
Masih Homadi peered from the crags of jagged black volcanic rocks where his troops had just taken cover and tried to steady his nerves for another assault.
Bear Gulch Reservoir reflects the towers of volcanic rock that give Pinnacles National Monument its name.
Mexico's Popocatepetl volcano is continuing to spout gases and hot rock fragments and it is dusting towns on its flanks with volcanic ash.
Mexican authorities have raised the threat level as Popocatepetl is continuing to spout gases and hot rock fragments and is dusting towns on its flanks with volcanic ash.
Hikers traverse the Valley of Ten Thousand Smokes on the Alaska Peninsula, walking on a sheet of ash and volcanic rock more than 500-feet-thick.
In 1980 Mount St Helens in Washington State suffered a catastrophic landslide that released seething volcanic gases and rock fragments in a cataclysm that destroyed hundreds of square miles of forest.
Twink 's is an alternative-rock take—think live drums and volcanic guitar chords.
A mass of small volcanic rock s nearly the size of Belgium has been discovered floating off the coast of New Zealand.
Mass of volcanic rocks , 'size of Belgium,' floating off New Zealand.
In replicating this sort of experiment within deep-sea volcanic rock, Fisher was embarking on an ambitious experimental program.
This set of swarms seems to be due to rock movement, not to volcanism.
Volcanic ash consists of rock, mineral, and volcanic glass fragments smaller than a tenth of an inch in diameter—or slightly larger than a pinhead.
For our March 2011 Best of Honolulu issue, we visited we visited Volcanic Rock Gym and watched owner Justin Ridgely teach writer, Victoria Wiseman, how to rock climb for the first time.
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In science:

For metallic glasses this principle is well known to material scientist , and it equally holds for glasses and other amorphous materials, such as glassy volcanic rocks.
Formulation of thermodynamics for the glassy state: configurational energy as a modest source of energy
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