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

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 tae 1,200 °C (1,292 tae 2,192 °F). 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.[1][2]

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.[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 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]

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