Hot Spring and sinter deposits, Yellowstone National Park, Wyoming
Yellowstone is an active volcano --a huge caldera that formed from an equally huge eruption some 600,000 years ago. It will likely erupt again sometime. But in the meantime, it displays a spectacular geothermal system, with geysers, fumaroles, hot springs and large stretches of hydrothermally deposited minerals. I thought this hot spring was particularly photogenic, with its green-blue waters seeming to drop off into the abyss --and white deposits of sinter (hydrothermally deposited silica) along its side. I was with my friend Randy, also a photographer. We were passing through after having spent a few great days backpacking in the Teton Range, just to the south.

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Go to the next photo, Granite, Rocky Mountain National Park.