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A volcano is a vent, or opening, in Earthâs surface through which molten rock, gases, and ash erupt. The word also refers to the form or structure, usually conical, produced by accumulations of erupted material.
On Earth, the energy that produces volcanic activity comes from heat left over from Earth's formation and from the decay of radioactive materials in its core. But Io and Enceladus are too small and too far away from the Sun to have any residual heat.