Volcano

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A volcano is a point on a moon or planet's surface where the hot material from the interior of the body erupts onto the surface. Volcanos have been discovered on planets such as Venus, Earth, and Mars. Several moons also show signs of volcanism.

Types of Volcano

Volcanos on Mars

The Tharsis region contains a number of extinct volcanos. Notable examples include Olympus Mons, Ascraeus Mons, Pavonis Mons, Arsia Mons, and Alba Patera.
The lava tubes of an extinct volcano may provide an ideal settlement location.

Hydrothermal vents

Volcanos are associated with hydrothermal vents. In these structures water forced through hot magma exits from cracks and may leave behind concentrated ore that have been leached from the rock that the hot water moves through.