Volcanic rocks (often shortened to volcanics in scientific contexts) are rocks formed from lava erupted from a volcano. Like all rock types, the concept...

metamorphic rock, and sedimentary rock. Adakite – Volcanic rock type Andesite – Type of volcanic rock Alkali feldspar granite – Type of igneous rock rich in...

much finer-grained, often resembling volcanic rock. Hypabyssal rocks are less common than plutonic or volcanic rocks and often form dikes, sills, laccoliths...

laccoliths, and volcanic necks. Intrusion is one of the two ways igneous rock can form. The other is extrusion, such as a volcanic eruption or similar...

Volcanic Rock is the second studio album by Australian rock band Buffalo, recorded and originally released in 1973 on the Vertigo label. The album was...

Extrusive rock refers to the mode of igneous volcanic rock formation in which hot magma from inside the Earth flows out (extrudes) onto the surface as...

A volcanic plug, also called a volcanic neck or lava neck, is a volcanic object created when magma hardens within a vent on an active volcano. When present...

are clastic rocks composed of rock fragments produced and ejected by explosive volcanic eruptions. The individual rock fragments are known as pyroclasts...

disordered array of liquid. Volcanic glass may refer to the interstitial material, or matrix, in an aphanitic (fine-grained) volcanic rock, or to any of several...

Morro Rock (Salinan: Le'samo; Chumash: Lisamu'; Spanish: El Morro) is a volcanic plug in Morro Bay, California, on the Pacific Coast at the entrance to...

stoner rock with the relentlessly spiralling outro". Buffalo's 1973 sophomore release Volcanic Rock has been "heralded as the first great stoner rock record...

Metavolcanic rock is volcanic rock that shows signs of having experienced metamorphism. In other words, the rock was originally produced by a volcano...

crevices in the rock. All of these processes, illustrated by serpentinization, are an important part of the destruction of volcanic rock. The role of water...

October 2019). "The Story Behind Iceland's Volcanic Elephant". Treehugger. Retrieved 22 November 2020. "Elephant Rock Iceland, Westman Islands". Arctic Adventures...

rock made of volcanic ash ejected from a vent during a volcanic eruption. Following ejection and deposition, the ash is lithified into a solid rock....

Vesicular texture is a volcanic rock texture characterized by a rock being pitted with many cavities (known as vesicles) at its surface and inside. This...

Volcanic ash consists of fragments of rock, mineral crystals, and volcanic glass, produced during volcanic eruptions and measuring less than 2 mm (0.079 inches)...

Scoria is a pyroclastic, highly vesicular, dark-colored volcanic rock formed by ejection from a volcano as a molten blob and cooled in the air to form...

Castle Rock (Scottish Gaelic: Creag a' Chaisteil, IPA:[ˈkʰʲɾʲekˈaˈxaʃtʰʲɪl]) is a volcanic plug in the middle of Edinburgh upon which Edinburgh Castle...

is dominated by volcanic rock. The Canary Islands and some seamounts to the north-east form the Canary Volcanic Province, whose volcanic history started...

Сибирские траппы, romanized: Sibirskiye trappy) is a large region of volcanic rock, known as a large igneous province, in Siberia, Russia. The massive...

titanium, whose content is low in volcanic arc rocks. Because volcanic rock is easily weathered and eroded, older volcanic arcs are seen as plutonic rocks...

pumicite in its powdered or dust form, is a volcanic rock that consists of highly vesicular rough-textured volcanic glass, which may or may not contain crystals...

Volcanism, vulcanism, volcanicity, or volcanic activity is the phenomenon where solids, liquids, gases, and their mixtures erupt to the surface of a solid-surface...

very near the surface of a rocky planet or moon. More than 90% of all volcanic rock on Earth is basalt. Rapid-cooling, fine-grained basalt is chemically...

amendment. Rhyolite is an extrusive igneous rock, formed from magma rich in silica that is extruded from a volcanic vent to cool quickly on the surface rather...

rhyolite, rock which is strongly resistant to erosion. About 58 million years ago, a volcanic eruption took place that covered the area around Castle Rock with...

column from the elements. They generally form within sedimentary rock and volcanic rock formations. Hoodoos range in size from the height of an average...

rock, although sometimes used as a synonym, normally now refers specifically to a high-silica-content (greater than 63% SiO2 by weight) volcanic rock...

Dacite (/ˈdeɪsaɪt/) is a volcanic rock formed by rapid solidification of lava that is high in silica and low in alkali metal oxides. It has a fine-grained...