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Gray Stormy Tornado

Photo: Tornado in gray stormy sky
A slender twister spins under storm-streaked skies in the U.S. In addition to typical land twisters, tornadoes may form over desert (dust devils), forest fires or volcanoes (firewhirls), or oceans (waterspouts).
Photograph by Carsten Peter

Earth Topics

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Mexico via Pacifico

Find unusual vacation spots and journey through Mexico.

Forces of Nature

Photo: A volcano erupting

Guide to the most powerful forces on Earth: earthquakes, volcanoes, hurricanes, and tornadoes.

Six Degrees Book and DVD

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Get an eye-opening warning of the dangers of climate change, one degree at a time.

Join the Geotourism Challenge

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Honor people and organizations that are innovators in geotourism.