volcanism -- n. The process by which magma and associated gases rise to the Earth's crust and are extruded, or expelled, onto the surface and into the atmosphere.
Chapter 18. Volcanism and Diastrophism
Chapter 19. Weathering Processes and Landforms
Chapter 20. Hillslope Processes and Landforms ...
The other major geologic process that affected the Moon's surface was mare volcanism.
volcanogenic massive sulfide deposit A mineral deposit of metallic sulfides formed directly through processes associated with volcanism, commonly in a submarine setting.
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 See also: Surface, Origin, Region, Plate, Crust
  
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