gas, geology, yellow, environment, enviroment, colour, national park, tourism,

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Photo credit: © dkaubo / Alamy / Afripics
License: Royalty Free
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Keywords: america, color, colour, countryside, enviroment, environment, fumaroles, gas, geology, heat, hot, landscape, lime, mammoth, national, nature, park, rocks, scenery, springs, states, steam, sulfur, summer, summerly, tourism, united, usa, warmth, water, white, wyoming, yellow, yellowstone