This is an image of the eruption of Stromboli volcano.
Click on image for full size
Image from: Dr. J. Alean, Eglisau, Switzerland
For more information, images and video about Stromboli volcano see Stromboli On-Line.
Volcanism is part of the process of bringing material up from the deep interior of a planet and spilling it forth on the surface. Eruptions also deliver fresh gases to the surface from the melted material below. Volcanism is part of the process by which a planet cools off. Even though they are not volcanos, geysers and hot springs are also part of the volcanic process, involving water and hydrothermal activity. Some planetary bodies, like Jupiter's moon Europa also exhibit icy volcanism where water takes the place of lava.
There are several ways in which a volcano forms, just as there are several different kinds of volcanoes. On Earth, the most general cause of volcanism is caused by lithospheric subduction.
There are quite a few other planets which have volcanoes on the surface, including Venus, Mars, and Jupiter's moon Io. Other planets exhibit the results of volcanic activity. These include Mercury, the Earth's Moon, Jupiter's moon Europa, and perhaps Neptune's moon Triton.
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