An unstable Earth -- Fire from below -- Tectonic plates -- Mount St. Helens -- Ash and dust -- Fiery rocks -- Gas and lightning -- Hot spots -- Ocean floor -- Mount Vesuvius -- St. Pierre -- Affecting the world's weather -- In hot water -- Sleeping beauties -- Life returns -- Studying volcanoes -- Other planets -- When the earth moves -- Intensity and magnitude -- Shock waves -- Measuring earthquakes -- Mud, fire, and floods -- State of emergency -- One step ahead -- Anger of the gods -- Did you know? -- Timeline -- Find out more.
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