Old Faithful, the most famous geyser in Yellowstone National Park, Wyoming, erupts, sending a cloud of steam into the air that somewhat mimics the clouds in the sky. The geyser's eruptions are not as predictable as the name Old Faithful might suggest. Eruptions can occur as little as 45 minutes apart or with a gap as long as 125 minutes. The geyser's height also varies; at times the column of water can reach 184 feet (56 meters) high.
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