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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.
Whereas volcanoes spew lava (called magma when it is beneath Earth's surface), geysers emit hot water and steam. The activity of geysers is labeled hydrothermal (from the Greek words hydro , meaning water, and therme , meaning heat). Hydrothermal activity also creates hot springs, fumaroles, and mud pots.