Jack Dykinga / Scalding hot water continuously spouting behind layers of mineral deposits, Fly Geyser, Black Rock Desert, Great Basin Desert, Nevada, USA
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Jack Dykinga / Scalding hot water continuously spouting behind layers of mineral deposits, Fly Geyser, Black Rock Desert, Great Basin Desert, Nevada, USA
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David Welling / Male Great Basin or Desert collared lizard (Crotaphytus insularis bicinctores) sits on a rock outcrop in Redding canyon, Owens valley, Inyo county, California, United States
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Konrad Wothe / Stony Desert, Black Desert, Libya, North Africa, November 2007
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Jenny E. Ross / Female Black-footed rock wallaby (Petrogale lateralis) with a joey in her pouch, preparing to launch herself from a rock ledge. West MacDonnell National Park, Northern Territory, Australia. September
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Jason Smalley / Shiny black volcanic rock strewn over the sand in the Black Desert, Western-Egypt.
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Jason Smalley / Shiny black volcanic rock strewn over the sand in the Black Desert, Western-Egypt.
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Jason Smalley / Shiny black volcanic rock strewn over the sand in the Black Desert, Western-Egypt.
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Jason Smalley / Shiny black volcanic rock strewn over sand in the Black Desert, Western-Egypt.
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Jason Smalley / Shiny black volcanic rock strewn over sand in the Black Desert, Western-Egypt.
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Jason Smalley / Shiny black volcanic rock strewn over sand in the Black Desert, Western-Egypt.
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Jason Smalley / Shiny black volcanic rock strewn over sand in the Black Desert, Western-Egypt.
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Tim Fitzharris / Cascades tumbling 110 feet at Emerald Pools, note the black streaks called desert varnish, Zion National Park, Utah
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Tim Fitzharris / Cascades tumbling 110 feet at Emerald Pools, note the black streaks called desert varnish, Zion National Park, Utah
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Tim Fitzharris / Cascades tumbling 110 feet at Emerald Pools, note the black streaks called desert varnish, Zion National Park, Utah
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Tim Fitzharris / Cascades tumbling 110 feet at Emerald Pools, note the black streaks called desert varnish, Zion National Park, Utah