The National Geographic Society -- one of the most respected organizations involved with the research, exploration, study, and documentation of geography, geology, and earth sciences -- has produced another video on the power and magnificence of volcanoes. This 60-minute presentation takes a tour of some of the earth's better-known volcanoes, including Mount Pinatubo in the Philippines and Japan's Mount Unzen. The video includes the history of volcanoes, how they were formed, why some are active or inactive, what triggers lava flows down in the earth's core, and interviews the scientists and volcanologists in their exploration to understand and forecast eruptions that could save human lives and property. And, of course, this documentary is powerful and stark with the photographic footage of the volcanoes
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