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Norris Geyser Basin, Wyoming

Photo: Norris Geyser Basin

Steam rising from the hot springs of Yellowstone's Norris Geyser Basin is illuminated by a full moon. Three times the size of Rhode Island, Yellowstone National Park holds some 10,000 geysers, hot pools, and other thermal features, the greatest concentration of such geologic activity in the world.

(Text adapted from and photograph shot on assignment for, but not published in, "Yellowstone at 100: Walk Through the Wilderness," May 1972, National Geographic magazine)

Photograph by Sam Abell

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