Is Obsidian Intrusive or Extrusive?


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?"
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.
Obsidian is an extrusive rock rather than intrusive. Extrusive rocks are formed by
Intrusions are magmas that intrude into a preexisting rock. Extrusion are lavas that extrude onto the surface of a preexisting rock (i.e. the surface of the Earth, whether it is on
Extrusive formations flow out of the Earth onto the surface of the planet, such as the basalt deposits of South America. Intrusive formations occur when magma does not break through
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