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Soâ¦how do beryl and chromium and vanadium get together to form emerald? How emeralds are formed. Plate tectonics shifts rock formations all over the place. Well, thatâs too much of an oversimplification, but it is the reason why ocean crust sometimes ends up scrunched together with continental rock. Part of the detailed explanation of plate tectonics.
Where Does Obsidian Form? Obsidian is usually an extrusive rock - one that solidifies above Earth's surface. However, it can form in a variety of cooling environments: along the edges of a lava flow (extrusive) along the edges of a volcanic dome (extrusive) around the edges of a sill or a dike (intrusive) where lava contacts water (extrusive)