Lava

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10-metre (33 ft) heich foontain o pāhoehoe lava, Hawaii, Unitit States

Lava refers baith tae mowten rock expelled bi a volcanae im an eruption an the resultin rock efter solitification an cuilin. This mowten 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. Whan first eruptit frae a volcanic vent, lava is a liquid at temperaturs frae 700 tae 1,200 °C (1,292 tae 2,192 °F). Up tae 100,000 times as viscous as watter, lava can flowe great distances afore cuilin an solidifeein acause o its thixotropic an shear thinnin properties.[1][2]

A lava flow is a muivin ootpourin o lava, that is creatit during a non-explosive effusive eruption. Whan it haes stappit muivin, lava solitifees 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, raither nor lava flowes. The wird "lava" comes frae Italian, an is probably derived frae the Laitin wird labes that means a faw or slide.[3][4] 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.[5] Serao describit "a flowe 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]

  1. 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 Juin 2008. 
  2. "Rheological properties of basaltic lavas at sub-liquidus temperatures: laboratory and field measurements on lavas from Mount Etna". cat.inist.fr. Retrieved 19 Juin 2008. 
  3. "Merriam-Webster OnLine dictionary". M-w.com. 2012-08-31. Retrieved 2013-12-08. 
  4. "Dictionary.com". Dictionary.reference.com. 1994-12-07. Retrieved 2013-12-08. 
  5. "Vesuvius Erupts, 1738". Lindahall.org. Retrieved 2013-12-08.