On Mt. Etna volcano, inhabited areas have been inundated repeatedly by lava flows in historical times. The increasing exposure of a larger population, which has almost tripled in the area around Mt. Etna during the last 150 ...
Earth Sciences
Nov 25, 2019
0
195
A collaboration between researchers at the University of Hawai'i (UH) at Manoa School of Ocean and Earth Science and Technology (SOEST), Hawai'i Pacific University (HPU) and the National Oceanic and Atmospheric Administration ...
Environment
Nov 11, 2019
0
7
Mars may seem to be an alien world, but many of its features look eerily familiar—such as this ancient, dried-up river system that stretches out for nearly 700 kilometres across the surface, making it one of the longest ...
Space Exploration
Oct 10, 2019
2
48
A new study of the Ovda Fluctus lava flow on Venus indicates that it is made of basaltic lava. This discovery weakens the notion that Venus might once have been Earth-like with an ancient ocean of liquid water.
Space Exploration
Oct 07, 2019
15
193
The Sahara Desert is vast, generously dusty, and surprisingly shy about its age. New research looking into what appears to be dust that the Sahara blew over to the Canary Islands is providing the first direct evidence from ...
Earth Sciences
Sep 23, 2019
0
15
When Kīlauea Volcano erupted in 2018, it injected millions of cubic feet of molten lava into the nutrient-poor waters off the Big Island of Hawai'i. The lava-impacted seawater contained high concentrations of nutrients that ...
Earth Sciences
Sep 05, 2019
2
623
Thomas Jones' "universal break-up criterion" won't help with meltdowns of the heart, but it will help volcanologists study changing lava conditions in common volcanic eruptions.
Earth Sciences
Aug 30, 2019
0
96
Italy's Stromboli volcano off the coast of Sicily erupted Wednesday, according to fire fighters who rushed to put out wildfires sparked by lava flows.
Environment
Aug 28, 2019
0
97
An international team of subsurface explorers from the University of Adelaide in Australia and the University of Aberdeen in Scotland has uncovered a previously undescribed Jurassic world of around 100 ancient volcanoes buried ...
Earth Sciences
Aug 13, 2019
4
55
Earth's magnetic field seems steady and true—reliable enough to navigate by.
Earth Sciences
Aug 07, 2019
9
784
Lava is molten rock expelled by a volcano during eruption. When first expelled from a volcanic vent, it is a liquid at temperatures from 700 °C to 1,200 °C (1,300 °F to 2,200 °F). Although lava is quite viscous, with about 100,000 times the viscosity of water, it can flow great distances before cooling and solidifying, because of both its thixotropic and shear thinning properties.
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. 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 Vesuvius between May 14 and June 4, 1737. Serao described "a flow of fiery lava" as an analogy to the flow of water and mud down the flanks of the volcano following heavy rain.
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