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Tollan Volcano

A typical volcano on Tollan.

Volcanoes are an opening, or rupture, in a planet's surface or crust, which allows hot, molten rock, ash, and gases to escape from below the surface. Volcanic activity involving the extrusion of rock tends to form mountains or features like mountains over a period of time.

The planet Tollan had volcanoes, but the planet was evacuated due to massive volcanic activity. (SG1: "Enigma")

File:Inferno11.jpg

The Daedalus orbits a planet with an about to erupt volcano.

The Taranis outpost on the planet Taranis used geothermal energy from a formerly dormant supervolcano to power its shield. However, as more energy was drawn, the volcano became extremely active. The Atlantis expedition came to Taranis to help most of the people escape, but the Stargate was buried in lava, and a massive dust cloud emerged from the volcano in a massive eruption, which rendered the planet uninhabitable for many years. (SGA: "Inferno")

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