Topic
Volcanic Rocks
2 questions tagged Volcanic Rocks — spanning every one of the seven Ws.
why
Why does obsidian look like volcanic glass?
Obsidian looks like glass because lava cooled so fast that crystals had no time to form. Its smooth, shiny appearance comes from this rapid cooling.
Earth ScienceVolcanic Rocks
where
Where is the Giant's Causeway-like columnar basalt at the Basaltic Prisms of Santa María Regla?
It is in Hidalgo, Mexico, near the town of Huasca de Ocampo. The site features tall basalt columns formed by cooling lava.
GeologyVolcanic Rocks