(CNN) — Here's some background information about volcanoes, mountains that open downward to a reservoir of molten rock. Facts: More than 80% of the Earth's surface, both above and below sea level, is ...

Snow covered the summit of Mauna Loa, the world’s largest active volcano, in Hawaii on January 5. While much of the state remained under a flood watch, rain fell as snow at the volcano’s 13,678 foot ...

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Lava is molten rock from a volcano that reaches the Earth’s surface. Liquid rock below the Earth’s surface is referred to as magma. More than 50% of the world’s active volcanoes above sea level ...