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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 Earth’s surface, both above and below sea ...
Cinder Cones are the simplest type of volcano, formed by the accumulation of tephra — ash, cinders, and larger fragments — erupted from a single vent. They are typically small, steep-sided ...
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