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volcano | Definition, Types, & Facts | Britannica

Volcano. Volcano, vent in the crust of the Earth or another planet or satellite, from which issue eruptions of molten rock, hot rock fragments, and hot gases. A volcanic eruption is an awesome display of the Earth's power. Yet while eruptions are spectacular to watch, .

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Igneous rock - definition of igneous rock by The Free ...

Related to igneous rock: Intrusive igneous rock. The term for a rock formed when molten rock cools and hardens. Extrusive, or volcanic, igneous rock cools on the surface as lava. Intrusive igneous rock forms when molten rock cools underground.

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Chapter 4 - Volcanism and Extrusive Rocks Flashcards

volcanic glass. one of the few rocks that is not composed of minerals. fine grained or glassy texture distinguishes extrusive rocks from most intrusive rocks.

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Plants & Animals Around Volcanoes | Sciencing

Apr 23, 2018 · Volcanic Soils. Although a volcanic eruption is very destructive, it also has benefits to the ecosystem around the volcano. Magma can contain silica, iron, magnesium, calcium, potassium and sodium, and thus the soil derived from weathering volcanic rocks .

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volcanic rock - Dictionary Definition : Vocabulary

volcanic rock: 1 n extrusive igneous rock solidified near or on the surface of the Earth Types: show 13 types... hide 13 types... 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 ...

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Felsic - Wikipedia

In order for a rock to be classified as felsic, it generally needs to contain more than 75% felsic minerals; namely quartz, orthoclase and plagioclase.Rocks with greater than 90% felsic minerals can also be called leucocratic, from the Greek words for white and dominance.. Felsite is a petrologic field term used to refer to very fine-grained or aphanitic, light-colored volcanic rocks which ...

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volcanic - English-Spanish Dictionary - WordReference

volcanic rock n noun: Refers to person, place, thing, quality, etc. (rock solidified on Earth's surface) roca volcánica loc nom f locución nominal femenina : Unidad léxica estable formada de dos o más palabras que funciona como sustantivo femenino ("casa de citas", "zona cero", "arma secreta").

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Volcanology photoglossary: explanation of volcanologic ...

Volcanic blocks are solidified rock fragments greater than 64 mm in diameter. Blocks commonly are ejected during explosive eruptions and consist of older pieces of the volcano's edifice, e.g. parts of the conduit, lava domes or older lava flows.

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Geology Glossary - Definitions of geological terminology

andesite - Igneous volcanic rock (~60% SiO 2), less mafic than basalt, but more mafic than dacite; rough volcanic equivalent of diorite. angle of repose - The steepest slope angle in which particular sediment will lie without cascading down. angstrom - A length of 10-10 meter or one hundred millionth of a centimeter. Its symbol is the Swedish letter Å. angular unconformity - An unconformity ...

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Geology Glossary - Definitions of geological terminology

Synonym for island arc. volcanic ash - A volcanic sediment of rock fragments, usually glass, less than 4 millimeters in diameter that is formed when escaping gases force out a fine spray of magma. volcanic ash fall - A deposit of volcanic ash resting where it was dropped by eruptions and winds. volcanic ash flow - A mixture of volcanic ash and gases that moves downhill as a density current in the atmosphere. .

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Types of volcanic rock — Science Learning Hub

Once the lava has erupted, it cools and solidifies into rock: Basalt magma often forms shield volcanoes. Andesite magma often forms cone volcanoes. Rhyolite magma often forms calderas. Depending on how much gas the magma contains, it can also form cone volcanoes. Basalt. The Earth's crust is mainly basalt rock. It is a heavy, dark, grainy rock.

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Volcano Vocabulary Terms for Study and Projects

Volcanic bomb: a mass of molten lava that is ejected during a pyroclastic explosion and hardens in the air. Volcanic bombs range in size from 2.5 in (64 mm) to several yards (meters) in diameter, and can weigh several tons.

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Selected Igneous terms - EIU

Mafic: Term used to describe volcanic rock or magma composed chiefly of dark-colored, iron- and magnesium-rich minerals. Magma: Molten rock that contains dissolved gas and crystals, formed deep within the Earth. When magma reaches the surface, it is called lava.

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USGS: Volcano Hazards Program Glossary

Sedimentary rocks Seismic swarm Seismic tomography Seismicity Shield volcano Silica Silicic Sinter Spatter cone Stratigraphy (Stratigraphic) Stratovolcano Subaerial Subduction Submarine volcano. T. Tectonic Tephra Tertiary Thermal Tsunami Tuff Tumulus. U. Unconsolidated. V. VEI Vent Volcaniclastic.

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GotBooks.MiraCosta.edu

Volcanic tuff is a name describing rocks composed of volcanic ejecta, such as broken pieces of volcanic glass, phenocrysts, rock fragments, etc., that has been welded together by the heat of an eruption to form a solid rock mass.

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term:pumice = volcanic rock Flashcards - Quizlet

Volcanic domes commonly form from all of the following rocks e. Volcanic domes grow from lava being injected into the interior. Which of the following plate boundaries is least likely to pro.

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What does volcanic rock mean? - definitions

Volcanic rock 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.

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Volcanoes Flashcards | Quizlet

volcanoes that consist primarily of erupted volcanic ash and rock fragments or cinders shield volcanoes gently sloping sides from large quantities of highly fluid lava in rather mild eruptions-central vent.

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Volcanic Rock Fire Twin Fever Slot - GREAT SESSION, ALL ...Click to view11:22

May 26, 2018 · The Volcanic Rock Fire Twin Fever Feature will transform a random number of reel positions wild when activated: sometimes you'll be treated to one volcano and other times both!

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3.4 Classification of Igneous Rocks – Physical Geology

Typically that means they are larger than about 0.5 mm — the thickness of a strong line made with a ballpoint pen. (If the crystals are too small to distinguish, which is typical of most volcanic rocks, we use the term aphanitic.) The intrusive rocks shown in Figure 3.13 .

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