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Read CNN’s Fast Facts about Volcanoes and learn more about mountains that open downward to a reservoir of molten rock.

CNN Editorial Research (CNN) — Here’s a look at volcanoes, mountains that open downward to a reservoir of molten rock. Facts:More than 80% of the

CNN Editorial Research Here's a look at volcanoes, mountains that open downward to a reservoir of molten rock.Facts:More than 80% of the Earth's surface,