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day
horizontal
natural
landmarks
north
america
united
states
of
u.s.a.
wyoming
world
heritage
site
national
parks
yellowstone
park
upper
geyser
basin
castle
geysers
eruption
erupting
spraying
spouting
steaming
steam
thermal
areas
surface
processes
physical
geography
geology
nature
scenics
landscapes
landscape
outdoors
power
in
heat
impact
collection