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Grand Geyser
An
eruption of Grand Geyser, the tallest predictable geyser in the world,
occurs every 7 - 15 hours. A classic fountain geyser, Grand erupts
from a large pool with powerful bursts rather than a steady column
like Old Faithful. An average eruption lasts 9 - 12 minutes and consists
of 1 - 4 bursts, sometimes reaching 200 feet (60m).
Old Faithful Area Tour
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