Related topics: volcano

Deep fractures and water-carved valleys on Mars

Mars displays fascinating geology everywhere you look—and nowhere is this more true than in the fractured, wrinkled ground seen in this image from ESA's Mars Express.

Researchers develop AI method for mapping planets

Creating geological maps of planetary surfaces such as those on Mars is a complex process. From data collection and analysis to publication in different formats, the production of maps is based on a time-consuming, multi-step ...

Scientists declare 2 Hawaii volcanoes have stopped erupting

U.S. scientists declared Tuesday that two active Hawaii volcanoes—one where lava destroyed hundreds of homes in 2018 and another where lava recently stalled before reaching a crucial Big Island highway—have stopped erupting.

Scientists say eruption of Hawaii volcano continues to ease

The eruption of the Mauna Loa volcano on Hawaii's Big Island continues to ease, scientists said Sunday, reinforcing an earlier pronouncement that the mountain's first flare-up in nearly 40 years might soon end.

Mauna Loa lava no longer imminent threat to Hawaii highway

Lava from the world's largest volcano is no longer an imminent threat to the main highway across the Big Island of Hawaii, scientists said Thursday, a development that was a welcome reprieve for motorists who depend on the ...

Hawaii road in limbo as Mauna Loa lava continues to crawl

About a week-and-a-half since the world's largest volcano began erupting, Hawaii officials continue to brace for slow-moving lava to intersect with a crucial Big Island road, even though scientists are not sure when or even ...

Indonesia's Mt. Semeru eruption buries homes, damages bridge

Improved weather conditions Monday allowed rescuers to resume evacuation efforts and a search for possible victims after the highest volcano on Indonesia's most densely populated island erupted, triggered by monsoon rains.

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Lava

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.

This text uses material from Wikipedia, licensed under CC BY-SA