Lava refers baith tae molten rock expelled bi a volcano during an eruption an the resultin rock efter solidification an cuilin. This molten rock is furmed in the interior o some planets, includin Yird, an some o thair satellites. The soorce o the heat that liquifies the rock within the yird is geothermal energy. When first eruptit frae a volcanic vent, lava is a liquid at temperaturs frae 700 to[convert: unkent unit]. Up tae 100,000 times as viscous as watter, lava can flow great distances afore cuilin an solidifyin acause o its thixotropic an shear thinnin properties.
A lava flow is a movin ootpourin o lava, which is creatit during a non-explosive effusive eruption. When it has stopped movin, lava solidifies tae furm igneous rock. The term lava flow is commonly shortened tae lava. Explosive eruptions produce a mixtur o volcanic ash an ither fragments cried tephra, rather nor lava flows. The wird "lava" comes frae Italian, an is probably derived frae the Laitin wird labes which means a faw or slide. The first uise in connection wi extrudit magma (molten rock ablo the Yird's surface) wis apparently in a short accoont written bi Francesco Serao on the eruption o Vesuvius atween Mey 14 an Juin 4, 1737. Serao describit "a flow o fiery lava" as an analogy tae the flow o watter an mud doun the flanks o the volcano follaein hivy rain.
References[eedit | eedit soorce]
- H. Pinkerton, N. Bagdassarov. "ScienceDirect – Journal of Volcanology and Geothermal Research : Transient phenomena in vesicular lava flows based on laboratory experiments with analogue materials". www.sciencedirect.com. Retrieved 19 June 2008.
- "Rheological properties of basaltic lavas at sub-liquidus temperatures: laboratory and field measurements on lavas from Mount Etna". cat.inist.fr. Retrieved 19 June 2008.
- "Merriam-Webster OnLine dictionary". M-w.com. 2012-08-31. Retrieved 2013-12-08.
- "Dictionary.com". Dictionary.reference.com. 1994-12-07. Retrieved 2013-12-08.
- "Vesuvius Erupts, 1738". Lindahall.org. Retrieved 2013-12-08.