Lava

Lava is molten or partially molten rock that has been expelled from the interior of a terrestrial planet or a moon onto its surface. Lava may be erupted at a volcano or through a fracture in the crust, on land or underwater, usually at temperatures from 800 to 1,200 °C. The volcanic rock resulting from subsequent cooling is also often called lava. A lava flow is an outpouring of lava during an effusive eruption. The viscosity of most lava is about that of ketchup, roughly 10,000 to 100,000 times that of water. Even so, lava can flow great distances before cooling causes it to solidify, because lava exposed to air quickly develops a solid crust that insulates the remaining liquid lava, helping to keep it hot and inviscid enough to continue flowing. The word lava comes from Italian and is probably derived from the Latin word labes, which means a fall or slide.

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Satellite spots glowing lava inside erupting Hawaiian volcano

Predicting lava flow

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Satellites track glowing lava from Hawaii's Mauna Loa eruption (photos)

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Satellite View of Stromboli’s New Eruption in Italy. You Can See a River of Lava Flowing to the Ocean

Mock lava worlds will help the James Webb Space Telescope understand exoplanets

Mock lava worlds will help the James Webb Space Telescope understand exoplanets

Lava erupting on Jupiter’s volcanic moon Io is over 1000°C