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OpenStudy (gabbyalicorn):
the above picture shows a type of igneous rock called obsidian. Why is the top rock so shiny and smoother than the others? It is made of sand-sized pieces of other rocks. It was formed when lava cooled very quickly. Years of weathering has made it smooth. It was formed inside a volcano.
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OpenStudy (gabbyalicorn):
i think B
OpenStudy (gabbyalicorn):
@JackofallTradez
OpenStudy (jackofalltradez):
It is B. Obsidian forms when lava cools very fast
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