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 cools down inside Earth. extrusion - extrusion is when lava cools down on Earth.
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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Pumice is solidified lava that gets a dark grey colouration after cooling. It is an extrusive rock that erupts from the volcano. Extrusive rock takes a little ...
Extrusive igneous rock is an igneous rock that is formed on the Earth's surface by volcanic activity. This is opposed to plutonic or intrusive rocks, which solidify ...
Intrusive volcanic features are those that form inside the volcano. A good example would be a magma reservoir. They are in contrast to extrusive volcanic features ...
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