Volcanoes Facts for Kids
Explosive facts about volcanoes and geology
Jupiter's moon Io is volcanically active not because of internal radioactivity like Earth, but because Jupiter's immense gravity constantly squeezes and flexes it. This tidal heating generates enough energy to drive hundreds of active volcanoes on Io's surface.
Saturn's moon Enceladus shoots geysers of water ice and organic molecules from cracks near its south pole β a type of cryovolcanism. Scientists believe this material comes from a liquid ocean beneath the ice, making Enceladus one of the most promising places to search for extraterrestrial life.
Flood basalt events are among the most extreme volcanic episodes on Earth, where lava pours out of fissures for hundreds of thousands of years and covers areas the size of continents. The Siberian Traps flood basalts erupted about 252 million years ago and are linked to the 'Great Dying,' the worst mass extinction in Earth's history.
Despite advances in seismology, gas monitoring, and satellite imaging, predicting exactly when and how violently a volcano will erupt remains one of the hardest problems in geoscience. False alarms and missed signals have each caused deaths and costly evacuations.
Lava fountains during Hawaiian-style eruptions can spray molten rock hundreds to even thousands of feet into the air. One 1959 fountain at KΔ«lauea Iki reached a record height of 1,900 feet β taller than the Empire State Building.
Inside volcanic caves, bizarre bacteria form stalactite-like drips called 'snottites' that drip pure sulfuric acid. These microbes survive entirely on volcanic gases and live in conditions once thought completely uninhabitable.
The most explosive volcanic eruptions are called Plinian eruptions, named after Pliny the Younger who described the 79 AD Vesuvius eruption. These eruptions shoot a column of gas and ash 12 to 30 miles into the stratosphere.
When Chile's Hudson volcano erupted in 1991, it blanketed enormous areas of Patagonia with ash up to 3 feet deep, killing livestock and devastating farms. Ash from that eruption was even deposited in the Falkland Islands, over 600 miles away.
Venus is thought to be covered in thousands of volcanoes, and radar imaging from spacecraft has detected features that may be active lava flows. The Soviet Venera 9 lander photographed sharp, fresh-looking volcanic rocks on Venus's surface in 1975.
Molten rock has two different names depending on where it is. When it's underground, it's called magma. The moment it erupts onto Earth's surface, that exact same rock is called lava!