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The terms lava stone and lava rock are more used by marketers than geologists, who would likely say "volcanic rock" (because lava is a molten liquid and rock is solid). "Lava stone" may describe anything from a friable silicic pumice to solid mafic flow basalt, and is sometimes used to describe rocks that were never lava, but look as if they ...
Some of the eruptive structures formed during volcanic activity (counterclockwise): a Plinian eruption column, Hawaiian pahoehoe flows, and a lava arc from a Strombolian eruption. Several types of volcanic eruptions—during which material is expelled from a volcanic vent or fissure—have been distinguished by volcanologists.
These eruptions are quiet because of the low viscosity of the lava and the small amount of trapped gases. The resulting sheet lava flows may be extruded from linear fissures or rifts or gigantic volcanic eruptions through multiple vents characteristic of the prehistoric era which produced giant flood basalts .
In a fiery spray of lava and ash, Italy’s Mount Etna erupted on July 4, sending molten rock cascading down one of Europe’s most active volcanoes and causing a temporary shutdown of the Catania ...
View more photos of the latest Kilauea eruption below. A lava lake forms at Halemaʻumaʻu crater, seen from the rim of the Kilauea caldera. (USGS/Handout via Reuters) (via REUTERS)
The word lava comes from Italian and is probably derived from the Latin word labes, which means a fall or slide. [2] [3] An early use of the word in connection with extrusion of magma from below the surface is found in a short account of the 1737 eruption of Vesuvius, written by Francesco Serao, who described "a flow of fiery lava" as an analogy to the flow of water and mud down the flanks of ...
The lava is flowin'. Molten rock likely from miles underground is flowing out of a newly opened fissure in the ground on Iceland's Reykjanes Peninsula. It's the latest activity in an already ...
Low viscosity lava can generate massive lava fountains, while lava of thicker viscosity can solidify within the vent, creating a volcanic plug. Volcanic plugs can trap volcanic gas and create pressure in the magma chamber, resulting in violent eruptions. [36] Lava is typically between 700 and 1,200 °C (1,300–2,200 °F). [37]