Volcanoes

Earth gives birth to volcanoes when hot magna rises to the surface, infiltrates weak spots in the outer crust, and explodes in a spectacular burst of energy and power that can kill thousands in moments. Despite this apparent danger, people insist on living near live volcanoes. In a high-tech look at man's attempts to control Mother Nature, learn how scientists test volcanoes for signs of impending activity, and why seemingly tranquil mountain peaks can reawaken to spew lava and ash without warning.

• documentary