(specifically, of certain geological features, such as volcano, geysers, etc) Emitting hot materials, such as lava, smoke, or steam, or producing tremors.
(geology) The inclusion of igneous rock in older rocks, or the development or localization of an ore body in older rocks. The latter is referred to as ore deposition.
(geology) A craton that has been remobilized during an orogenic event but is still recognizable dominantly through its rheological, geochronological and isotopic characteristics.
(geology) Being or relating to a type of metamorphic rock originally produced by a volcano, either as lava or tephra, then buried and subjected to high pressures and temperatures, causing it to recrystallize.
(volcanology) A type of volcanic eruption marked by the ejection of large columns of volcanic debris and gases into the stratosphere; particularly large amounts of pumice, caused by a very powerful, gas-driven eruption.
(by extension, geology) Synonym of plutonic (“of or pertaining to rocks formed deep in the Earth's crust, rather than by volcanoes at the surface of the Earth”)
The old geological theory that the rocks forming the Earth were formed in fire by volcanic activity, with a continuing gradual process of weathering and erosion, then deposited on the sea bed, re-formed into layers of sedimentary rock by heat and pressure, and raised again.
(astronomy, geology) A small, shallow indentation or pit on the surface of a meteorite, resembling a thumbprint impression in clay, created by ablation while falling in an atmosphere.
(geology) A region similar in appearance to karst topography, characterized by an irregular land surface, with bogs, pits, and other depressions, formed in areas of permafrost due to ice melting.
Alternative form of Vulcanalia (“Ancient Roman festival”) [The Ancient Roman festival of the god Vulcan, celebrated on August 23, during which live fish or small animals were thrown into bonfires as a sacrifice.]
(volcanology, meteorology) Electrical discharge that occurs during a volcanic eruption, caused by a build-up of static electricity in colliding ejecta (such as ash and debris).
A vent or fissure on the surface of a planet (usually in a mountainous form) with a magma chamber attached to the mantle of a planet or moon, periodically erupting forth lava and volcanic gases onto the surface.
(Roman mythology) The god of volcanoes and fire, especially the forge, also the patron of all craftsmen, principally blacksmiths. The Roman counterpart of Hephaestus.
Alternative spelling of volcanism (“volcanic activity”) [(volcanology) Any of the natural phenomena and processes associated with the action of volcanos, geysers and fumaroles]
Obsolete form of volcano. [A vent or fissure on the surface of a planet (usually in a mountainous form) with a magma chamber attached to the mantle of a planet or moon, periodically erupting forth lava and volcanic gases onto the surface.]
(geology) Mechanical or chemical breaking down of rocks in situ by weather or other causes.
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