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What kind of rock is obsidian igneous or metamorphic?
obsidian is an igneous rock, it is not formed from sediment, or a rock going under heat and pressure for the second time it is formed when a volcano erupts and it cools very quickly giving it a...
Obsidian is an igneous rock due to the nature in which it was formed. Obsidian is formed when lava from volcanoes is hurled high into the air, cools quickly upon falling and becomes the glassy rock...