Plate tectonics map with volcano locations indicated with red circles

Volcanism, vulcanism or volcanicity is the phenomenon of eruption of molten rock (magma) onto the surface of the Earth or a solid-surface planet or moon, where lava, pyroclastics, and volcanic gases erupt through a break in the surface called a vent.[1] It includes all phenomena resulting from and causing magma within the crust or mantle of the body, to rise through the crust and form volcanic rocks on the surface. Magmas that reach the surface and solidify form extrusive landforms.[2]

  1. ^ "Cooling Planets: Some Background: What is volcanism?" (PDF). The Lunar and Planetary Institute, Department of Education and Public Outreach. 2006. p. 4. Archived (PDF) from the original on 2013-08-01. Retrieved 2012-10-14.
  2. ^ Leong, Goh Cheng (1995-10-27). Certificate Physics And Human Geography; Indian Edition. Oxford University Press. p. 20. ISBN 978-0-19-562816-6.

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