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Volcanic rock ( often shortened to volcanics in scientific contexts ) is a rock formed from magma erupted from a volcano.
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Volcanic and rock
Volcanic rock at Pagua Bay, Dominica
Volcanic rocks, especially of the acidic type such as felsites and rhyolites, may have a cryptocrystalline groundmass as distinguished from pure obsidian ( acidic ) or tachylyte ( basic ), which are natural rock glasses.
Volcanic rock is to be found in numerous areas in the county, at Carrigogunnell, at Knockfierna, and principally at Pallasgreen / Kilteely in the east, which has been described as the most compact and for its size one of the most varied and complete carboniferous volcanic districts in either Britain and Ireland.
One of the largest Holocene eruptions in Iceland was the Hekla 3 ( or H < sub > 3 </ sub >) eruption of ( 950 BC ) ( 1159 BC ) which threw about 7. 3 km < sup > 3 </ sup > of volcanic rock into the atmosphere, placing its Volcanic Explosivity Index ( VEI ) at 5.
Volcanic ash consists of fragments of pulverized rock, minerals and volcanic glass, created during volcanic eruptions, less than 2 mm ( 0. 079 in ) in diameter.
Volcanic glass can refer to the interstitial, or matrix material in an aphanitic ( fine grained ) volcanic rock or can refer to any of several types of vitreous igneous rocks.
Raimonds Cirulis, a Latvian interior designer, created a Volcanic Hanging Chair that is a 100 % handmade piece of furniture and is made out of volcanic rock.
Volcanic land is subdivided by volcanic rock which is decomposing and that which has not.
Volcanic rocks are among the most common rock types on Earth's surface, particularly in the oceans.
The area owes its remarkable geology to layers of volcanic rock and ash deposited by Pyroclastic flow from a volcanic explosion within the Jemez Volcanic Field that occurred 6 to 7 million years ago.
* Volcanic rock
Volcanic rock occurs in the northwest just east of the Gotel Mountains and northeast of Ngaoundéré, the provincial capital, along the border with the North Province.
The first meaning, common in geology and paleontology, refers to a former soil preserved by burial underneath either sediments ( alluvium or loess ) or volcanic deposits ( Volcanic ash ), which in the case of older deposits have lithified into rock.
Volcanic pipes are composed of a deep, narrow cone of solidified magma ( described as " carrot-shaped "), and are usually largely composed of one of two characteristic rock types — kimberlite or lamproite.
The Borrowdale Volcanic Group is a group of igneous rock formations named after the Borrowdale area of the Lake District, in England.
# REDIRECT Volcanic rock
Volcanic rocks and rock pyramids can be observed at the foot of Kozhuh.
# REDIRECT Volcanic rock
# REDIRECT Volcanic rock
Volcanic and often
Volcanic rocks often have a vesicular texture caused by voids left by volatiles escaping from the molten lava.
Districts close to the Volcanic Plateau are higher and more rugged, often subject to harsh temperatures in winter.
Individual eruptions were often enormous, sometimes up to thousands of cubic kilometres in volume, giving them a Volcanic Explosivity Index of 8, comparable to Yellowstone Caldera and Lake Toba eruptions.
* Volcanic caldera ridges: Large volcanoes often leave collapsed central calderas that are bordered by circular ridges.
Volcanic rocks classified according to the nature and abundance of phenocryst assemblages are often described as aphyric when fewer than 1 % phenocrysts are visible with a hand lens.
The North Island Volcanic Plateau ( often called the Central Plateau and occasionally the Waimarino Plateau ) is a volcanic plateau covering much of central North Island of New Zealand with volcanoes, lava plateaus, and crater lakes.
Volcanic craters from phreatic eruptions often occur on plains away from other obvious volcanoes.
Volcanic bombs can be thrown many kilometres from an erupting vent, and often acquire aerodynamic shapes during their flight.
Whakarewarewa ( reduced version of Te Whakarewarewatanga O Te Ope Taua A Wahiao, meaning The gathering place for the war parties of Wahiao, often abbreviated to Whaka by locals ) is a geothermal area within Rotorua city in the Taupo Volcanic Zone of New Zealand.
The Central America Volcanic Arc ( often abbreviated to CAVA ) is a chain of volcanoes which extends parallel to the Pacific coast line of the Central American Isthmus, from Guatemala, El Salvador, Honduras, Nicaragua, Costa Rica and down to northern Panama.
Volcanic and scientific
Recent scientific work indicates that the Earth's crust below the Taupo Volcanic Zone may be as little as 16 kilometres thick.
Volcanic and is
Mount Baker ( Lummi: Qwú ’ mə Kwəlshéːn ; Nooksack: Kw ’ eq Smaenit or Kwelshán ), also known as Koma Kulshan or simply Kulshan, is an active glaciated andesitic stratovolcano in the Cascade Volcanic Arc and the North Cascades of Washington State in the United States.
Volcanic eruptions are not rare, and the area is prone to earthquakes and tsunamis because of this.
It is the most active volcanic centre in the South Aegean Volcanic Arc, though what remains today is chiefly a water-filled caldera.
In a boundary running the length of the island and continuing southwards in the Luzon Volcanic Arc ( including Green Island and Orchid Island ), the Eurasian Plate is sliding under the Philippine Sea Plate.
* August 9 – Lassen Volcanic National Park is established in California.
The volcano is located in the Cascade Range and is part of the Cascade Volcanic Arc, a segment of the Pacific Ring of Fire that includes over 160 active volcanoes.
Volcanic glass may be present, particularly as rinds on rapidly chilled surfaces of lava flows, and is commonly ( but not exclusively ) associated with underwater eruptions.
Lava Creek Tuff is known to be at least 1000 times as large as the deposits of the May 18, 1980 eruption of Mount St. Helens, and it had a Volcanic Explosivity Index ( VEI ) of 8 — greater than any eruption known in the last 10, 000 years.
:* Volcanic ash is contained in some layers, and can be used to establish the time of the layer's formation.
Mount Ruapehu, or just Ruapehu, is an active stratovolcano at the southern end of the Taupo Volcanic Zone in New Zealand.
Volcanic Mount Damavand,, located in the center of the Alborz, is not only the country's highest peak but also the highest mountain on the Eurasian landmass west of the Hindu Kush.
Volcanic debris, especially lahars, also have a leveling effect and the storage of water in the form of snow and ice is also important.
A portion of the Adel Mountains Volcanic Field is in the southwest corner of the county.
Rathlin is of prehistoric volcanic origin, having been created as part of the British Tertiary Volcanic Province.
Undara Volcanic is a national park in North Queensland, Australia and is notable for its lava tubes and gem fossicking.
Shingletown is located at ( 40. 496033 ,-121. 863657 ) in upstate California, near Lassen Volcanic National Park.
* Weed is located on the Volcanic Legacy Scenic Byway, and is a short distance from the Pacific Crest Trail.
Just south of Bend is Newberry National Volcanic Monument on U. S. Route 97.
Volcanic ash of different hues is in great abundance, and there are some interesting botanic species of Canary Islands origin.
Flat-slab subduction is ongoing beneath part of the Andes causing segmentation of the Andean Volcanic Belt into four zones.
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