volcanic rock

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Noun1.volcanic rock - extrusive igneous rock solidified near or on the surface of the Earthvolcanic rock - extrusive igneous rock solidified near or on the surface of the Earth
agglomerate - volcanic rock consisting of large fragments fused together
amygdaloid - volcanic rock in which rounded cavities formed by expanding gas have subsequently become filled with mineral deposits
dacite - a grey volcanic rock containing plagioclase and quartz and other crystalline minerals
basalt - the commonest type of solidified lava; a dense dark grey fine-grained igneous rock that is composed chiefly of plagioclase feldspar and pyroxene
volcanic glass - a kind of natural glass produced when molten lava cools very rapidly
lava - rock that in its molten form (as magma) issues from volcanos; lava is what magma is called when it reaches the surface
tuff, tufa - hard volcanic rock composed of compacted volcanic ash
igneous rock - rock formed by the solidification of molten magma
References in classic literature ?
The surrounding shores were wild and broken, with overhanging cliffs and precipices of black volcanic rock.
In pursuing his course westward, Captain Bonneville generally kept several miles from Snake River, crossing the heads of its tributary streams; though he often found the open country so encumbered by volcanic rocks, as to render travelling extremely difficult.
Subjects covered in the text include the internal architecture of volcanic gas reservoirs, volcanic rock sequence division and stratigraphic correlation, identification and prediction of volcanic facies, lithological identification and prediction of volcanic rock, and many others.
They cover the exploration history and features of volcanic reservoirs, the formation and distribution of volcanic rock, characteristics of volcanic reservoirs, their geology, areas of exploration in volcanic reservoirs, and prediction and evaluation technology for volcanic rock.
Take a look around, and it might look "just like a great pile of volcanic rock, not much more," Rodda says.
London, Sept 3 (ANI): Rafts of volcanic rock could have played a significant role in the emergence of some of the earliest organisms on Earth, scientists have said.
I have found, after using various planting mediums, that volcanic rock (1/2-3/4" diameter) is ideal.
If that's the case, Volcanic Rock is going to be suited by the return to hurdles for the first time since August, when he finished third on heavy ground at Bellewstown off today's mark.
Sketches of earth strata illustrate how superheated water and steam penetrate pores in volcanic rock and bubble up through sedimentary rock and the earth's crust.
From the color ,and texture of the surface, scientists had guessed that Ebenezer, which lies in an area known as Columbia Hills, might be a volcanic rock that had remained unaltered for eons.
For about eight kiometres there is a whole series of these gold occurrences in the volcanic rock.
Last Chance Canyon's colorful geology resulted from a mixture of differing sediments and volcanic rock strata, federal officials said.