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.