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Fumaroles may occur along tiny cracks or long fissures, in chaotic clusters or fields, and on the surfaces of lavaLava is molten rock that a volcano expels during an eruption. Due to its high temperature, lava can be quite fluid when first exuded from a volcanic vent, but eventually solidifies into rock. However, the lava may flow many miles before solidification. flows and thick deposits of pyroclastic flowPyroclastic flows are a common and devastating result of some volcanic eruptions. They are fast moving fluidized bodies of hot gas, ash and rock (collectively known as tephra) which can travel away from the vent at up to 150 km/h. The gas is usually at as. A fumarole field is an area of thermal springs and gas vents where magmaThis article is about the type of rock. For magmas in mathematics, see Magma (algebra). For the experimental jazz band, see Magma (band). For the computer algebra system, see Magma computer algebra system. For the EDA software company, see Magma Design Au or hot igneous rockIgneous rocks are formed when molten rock ( magma) cools and solidifies, with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive ( volcanic) rocks. This magma can be derived from either the Eas at shallow depth are releasing gasses or interacting with groundwaterGroundwater is any water found below the land surface. It is found in aquifers, in the pore spaces of rocks, in unconsolidated sediments, as permafrost, and as soil moisture. Groundwater flows to the surface naturally at springs and seeps and can form oas. From the perspective of groundwater, fumaroles could be described as a hot spring that boils off all its water before the water reaches the surface

A good example of fumarole activity on Earth is the famous Valley of Ten Thousand SmokesThe Valley of Ten Thousand Smokes is a valley within Katmai National Park and Preserve which is filled with ash flow from the eruption of Novarupta on June 6- June 8, 1912. Following the eruption there were thousands of fumaroles venting steam from the as, which was formed during the 1912 eruption of Novarupta in Alaska. Initially, there were thousands of fumaroles in the cooling ash from the eruption, but over time most of them have become extinct. Fumaroles may persist for decades or centuries if they are above a persistent heat source, or disappear within weeks to months if they occur atop a fresh volcanic deposit that quickly cools.