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** Lava **

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"Lava flow" redirects here. For the programming anti-pattern, see Lava flow
For other uses, see Lava (disambiguation).
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10-metre (33 ft) high fountain of pāhoehoe lava, Hawaii, United States
Lava flow during a rift eruption at Krafla, Iceland in 1984.

*Lava* refers both to molten rock expelled by a volcano during an eruption
and the resulting rock after solidification and cooling. This molten rock
is formed in the interior of some planets, including Earth, and some of
their satellites. The source of the heat that liquifies the rock within the
earth is geothermal energy. When first erupted from a volcanic vent, lava
is a liquid at temperatures from 700 to 1,200 °C (1,292 to
2,192 Â°F). Up to 100,000 times as viscous as water, lava can flow great
distances before cooling and solidifying because of its thixotropic and
shear thinning properties.^[1]^[2]

A /lava flow/ is a moving outpouring of lava, which is created during a
non-explosive effusive eruption. When it has stopped moving, lava
solidifies to form igneous rock. The term /lava flow/ is commonly shortened
to /lava/. Explosive eruptions produce a mixture of volcanic ash and other
fragments called tephra, rather than lava flows. The word "lava" comes from
Italian, and is probably derived from the Latin word /labes/ which means a
fall or slide.^[3]^[4] The first use in connection with extruded magma
(molten rock below the Earth's surface) was apparently in a short account
written by Francesco Serao on the eruption of


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