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volcanic rock

n. extrusive igneous rock solidified near or on the surface of the Earth

Volcanic rock

Volcanic rock (often shortened to volcanics in scientific contexts) is a rock formed from magma erupted from a volcano. In other words, it differs from other igneous rock by being of volcanic origin. Like all rock types, the concept of volcanic rock is artificial, and in nature volcanic rocks grade into hypabyssal and metamorphic rocks and constitute an important element of some sediments and sedimentary rocks. For these reasons, in geology, volcanics and shallow hypabyssal rocks are not always treated as distinct. In the context of Precambrian shield geology, the term "volcanic" is often applied to what are strictly metavolcanic rocks.

Volcanic rocks are among the most common rock types on Earth's surface, particularly in the oceans. On land, they are very common at plate boundaries and in flood basalt provinces.

Volcanic Rock (album)

Volcanic Rock is the second album for Australian proto- heavy metal band Buffalo, recorded and originally released in 1973 on the Vertigo label. The album was stylistically a much harder, heavier and rawer release than its predecessor ( Dead Forever...) – marking a move away from the band's previous progressive rock influences, although retaining a psych element to their sound. Volcanic Rock had been recorded effectively as a live-in-the-studio effort, with only vocal and additional guitar overdubs added later during the recording sessions.

The album courted controversy with its cover artwork upon its release. Illustrated by J. Phillip Thomas, the artwork was designed as a vertically opening gatefold cover, with the top half of the cover (i.e. the front cover) depicting an androgynous human standing atop a volcanic mountain holding up a phallus-shaped rock, whilst the lower half of the cover (i.e. rear cover) depicted the base of the mountain as the lower half of a female torso (viewed from the rear), menstruating molten lava. Inevitably, it led to accusations of misogyny towards the band and many record stores either refusing to stock or display the album on the shelves as a result.

Despite this, the album is regarded by both many fans and critics as the band's most musically accomplished effort and has subsequently become a much sought-after album by music collectors. The album was remastered and reissued in September 2005 by Australian record label Aztec Music on CD with additional tracks.

"Freedom" was covered by Screaming Trees as an unlisted B-side to their single "Butterfly" from Sweet Oblivion.

Usage examples of "volcanic rock".

The volcanic rock that made up its rounded sides was almost as smooth as if it had been polished by some immense boring tool.

Standing alone on its bit of volcanic rock, it peered out to sea&mdash.

He also describes immense walls of black volcanic rock in the island.

Standing alone on its bit of volcanic rock, it peered out to sea—.

Spires of twisted black volcanic rock rose on all sides, and the ground was so littered with sharp bits of flint that Spock and David needed to choose each step with care.

The stretch of savannah ended in a cliff of some dark volcanic rock, and a dense forest spilled over the lip of the cliff, a thick green-black.

She held a core of what looked like obsidian, a glassy volcanic rock.

The bank is made of soft eroded stone with lumps of hard black volcanic rock jutting out of it frequently, and by clambering from one outcropping to the next, Doug is able to make his way halfway up the bank in the time it takes Enoch Root to locate one safe place to plant their feet.