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Lobby > Exhibits > Hot Water Treasures > Types of Thermal Features > Steam Vents > Under the Pavement Steam VentsUNDER THE PAVEMENT The great heat beneath Yellowstone creates constant change. In 1999, this steam vent began under the parking lot at Mud Volcano.  Next | 1 > 2 > 3 > 4 | Next Section: Geysers 
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