"Witness the power of our restless planet--from violent eruptions to terrifying tsunamis"--Cover.

Includes index.

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.

Photographs and text explain the causes and effects of volcanoes and earthquakes and examine specific occurrences throughout history.

008-012.