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Photograph of tufas at Agua Caliente I. These lighter-colored tufas are found coating large darker-colored volcanic boulders throughout the landscape and provide valuable clues about past lake level changes. (Photograph by Christine Chen)

Photograph of tufas at Agua Caliente I. These lighter-colored tufas are found coating large darker-colored volcanic boulders throughout the landscape and provide valuable clues about past lake level changes. (Photograph by Christine Chen)