Yellowstone National Park
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Photo credit: © Zachary Frank / Alamy / Afripics
License: Royalty Free
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Keywords: ., active, america, americans, bridger, caldera, ecosystem, geothermal, grant, idaho, jim, montana, national, native, nature, north, outdoor, park, preserve, president, service, states, supervolcano, thermal, travel, ulysses, united, volcano, wyoming, yellowstone