Nature
5
Mineral stains mark sites of hot springs and steam vents in the canyon walls. For thousands of years, upwardly percolating fluids have altered the chemistry of the rocks, turning them yellow, red, white, and pink. From the rim, bright patches of color are the most visible evidence of hot spots. Puffs of steam, visible on all but the warmest days of summer, mark areas of ongoing thermal activity in the canyon.
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Wyoming · United States
