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.
Volcanoes bring material from the deep interior of a planet and spilling it onto the surface. Eruptions of volcanoes also put new molecules into the atmosphere. Volcanism is part of the process by which a planet cools off.
Even though they are not volcanoes, geysers are also part of the volcanic process, involving water.
There are several ways in which a volcano forms, just as there are several different kinds of volcanoes.
There are quite a few other planets which have volcanoes on the surface, including Venus, Mars, and Jupiter's moon Io. Other planets seem to have had volcanic activity in the past. These include Mercury, the Earth's Moon, Jupiter's moon Europa, and perhaps Neptune's moon Triton.
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