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Is Obsidian Intrusive or Extrusive?
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Obsidian is considered to be a black extrusive, igneous rock. It is characterised by a shiny surface and it is created by volcanic gas. Obsidian comprises of high contents of silica.
Q&A Related to "Is Obsidian Intrusive or Extrusive?"
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intrusion - intrusion is when magma/lava enters a rock, forming an igneous rock. extrusion - extrusion is when magma covers the surface of sedimentary rock and hardens.
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Extrusive means on the earths surface, while Intrusive means below\within the earths crust.
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Obsidian is an extrusive rock rather than intrusive. Extrusive rocks are formed by
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Intrusive Rocks are found underneath Earths crust, while Extrusive rocks are found above Earths crust.
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Obsidian is a naturally occurring volcanic glass formed as an extrusive igneous rock.
It is produced when felsic lava extruded from a volcano cools rapidly with minimum crystal...
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