About 1,500 active volcanoes can be found around the world. Learn about the major types of volcanoes, the geological process behind eruptions, and where the most destructive volcanic eruption ever witnessed occurred.
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Read more in "Volcanoes, explained"
Learn more about the Taal Volcano eruption: https://on.natgeo.com/2QTAw97
Volcanoes 101 | National Geographic
If you look out your window, you'll probably notice a bunch of things; houses, streets... hopefully a tree. But beyond that you'll see things like mountains, rivers, volcanoes... well, hopefully not a volcano. These are landforms and they come in different varieties. In this episode, Sabrina chats about how things like mountains, volcanoes, and plateaus come into being.
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View full lesson: http://ed.ted.com/lessons/how-tsunamis-work-alex-gendler
The immense swell of a tsunami can grow up to 100 feet, hitting speeds over 500 mph -- a treacherous combination for anyone or anything in its path. Alex Gendler details the causes of these towering terrors and explains how scientists are seeking to reduce their destruction in the future.
Lesson by Alex Gendler, animation by Augenblick Studios.