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Wednesday, 22-Dec-2004 10:09:32 Eastern Standard Time
http://www.nps.gov
/archive/yell/kidstuff/OlderKids/puzzles/white-dome_puzzle.htm
White Dome Geyser's beautifully shaped cone is many
centuries old, and is still growing with each eruption. For thousands of years,
thermal water has been building the cone that you see today--one of the largest
in Yellowstone. White Dome grows older and more massive as more and more bumps
form on its gnarly, ancient cone. Inside the cone is a narrow vent. Each time
water bursts through this small passageway, silica is deposited on its walls.
Very gradually, White Dome's vent is growing narrower!
