fire-fountain A continuous spray of disrupting magma through a vent to form a persistent fountain of molten magma above the vent. The fountain, which may rise to 200 m, is supported either by the hydrostatic pressure of magma in the upper levels of the main volcanic superstructure, or by expanding gas released from the magma during the eruption. Fall-out from the column produces a spatter rampart around the vent and if the accumulation rate is high the molten spatter may coagulate to form a flow of lava (a ‘clastogenic flow’).
More From encyclopedia.com
Bankfull Flow , bankfull flow Hypopycnal Flow , hypopycnal flow Debris Flow , Debris flow Debris flow is a process in which water-saturated masses of material ranging from sand grains to boulders move across low slopes. These f… Flow , Flow BIBLIOGRAPHY Embedded within and critical to the burgeoning field of positive psychology, the concept of flow represents an optimal state of con… Baseflow , baseflow(dry-weather flow) In a stream or river, the flow of water derived from the seepage of groundwater, and/or through-flow into the surface wate… Lava , Lava Lava is molten rock that has been extruded onto Earth's surface. Before it reaches the surface, lava is called magma . Magma contains crystals ,…
About this article
Updated About encyclopedia.com content Print Article
You Might Also Like