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Olympus Mons compared to Arizona
Olympus Mons compared to Arizona

Natural Selections: Extraterrestrial Volcanoes

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Planetary probes continue to bring us remarkable images of other worlds. Images of Venus show a blast furnace environment crossed by rivers of molten rock. On Mars one can see a shield volcano the size of Arizona. Martha Foley and Dr. Curt Stager take us out of this world.

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