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September 12, 2009 - Chromatic Pool Hot Spring, Upper Geyser Basin geothermal area, Yellowstone Caldera, Yellowstone National Park, Wyoming.
September 12, 2009 - Morning Glory Pool Hot Spring, Upper Geyser Basin geothermal area, Yellowstone Caldera, Yellowstone National Park, Wyoming.
September 12, 2009 - Morning Glory Pool Hot Spring, Upper Geyser Basin geothermal area, Yellowstone Caldera, Yellowstone National Park, Wyoming.
September 12, 2009 - Morning Glory Pool Hot Spring, Upper Geyser Basin geothermal area, Yellowstone Caldera, Yellowstone National Park, Wyoming.
September 12, 2009 - Chromatic Pool Hot Spring, Upper Geyser Basin geothermal area, Yellowstone Caldera, Yellowstone National Park, Wyoming.
September 12, 2009 - Steam rising over Midway Geyser Basin geothermal area, Yellowstone Caldera, Yellowstone National Park, Wyoming.
September 12, 2009 - Grand Prismatic Spring, Midway Geyser Basin geothermal area, Yellowstone Caldera, Yellowstone National Park, Wyoming.
September 11, 2009 - White Dome Geyser erupting, Lower Geyser Basin geothermal area, Yellowstone Caldera, Yellowstone National Park, Wyoming.
Common raven (Corvus corax), Yellowstone National Park, Wyoming, United States of America, North America
Black bear (Ursus americanus) sow and two chocolate cubs of the year or spring cubs, Yellowstone National Park, Wyoming, United States of America, North America
East slopes of Haystack Mesa in Petrified Forest National Park, Arizona, United States of America, North America
American badger (Taxidea taxus), Yellowstone National Park, Wyoming, United States of America, North America
Red fox (Vulpes vulpes) (Vulpes fulva) carrying Uinta ground squirrel (Urocitellus armatus) prey, Yellowstone National Park, Wyoming, United States of America, North America
Red fox (Vulpes vulpes) (Vulpes fulva) kit posing, Yellowstone National Park, Wyoming, United States of America, North America
Hoodoo filled cliffs on the north side of Blue Mesa in Petrified Forest National Park, Arizona, United States of America, North America
The east cliffs of Blue Mesa near sunset, Petrified Forest National Park, Arizona, United States of America, North America
Billings Gap Overlook on Blue Mesa towards sunset, Petrified Forest National Park, Arizona, United States of America, North America
Red fox (Vulpes vulpes) (Vulpes fulva) vixen and kit in the fog, Yellowstone National Park, Wyoming, United States of America, North America
Red fox (Vulpes vulpes) (Vulpes fulva) vixen nursing her kits, Yellowstone National Park, Wyoming, United States of America, North America
Bison (Bison bison) cow and calf running in the rain, Yellowstone National Park, Wyoming, United States of America, North America
Black bear (Ursus americanus) yearling cub climbing a tree, Yellowstone National Park, Wyoming, United States of America, North America
A cliff cave below Crystal Mesa west of Hamilili Point in Petrified Forest National Park, Arizona, United States of America, North America
A rock spire sculpted by the wind on Crystal Mesa west of Hamilili Point in Petrified Forest National Park, Arizona, United States of America, North America
A small bentonite arch in Goblin Garden west of Hamilili Point in Petrified Forest National Park, Arizona, United States of America, North America
Goblin Garden west of Hamilili Point in Petrified Forest National Park, Arizona, United States of America, North America
Goblin Garden west of Hamilili Point in Petrified Forest National Park, Arizona, United States of America, North America
Crystal Mesa above Crystal Creek west of Hamilili Point in Petrified Forest National Park, Arizona, United States of America, North America
A sloping red sand dune above Hamilili Wash in Petrified Forest National Park, Arizona, United States of America, North America
Ephemeral Spring on Red Wall of Roaring Springs Canyon, North Kaibab Trail, Grand Canyon North Rim, UNESCO, Arizona, United States of America
Red Wall Bridge crossing Roaring Springs Canyon on North Kaibab Trail, Grand Canyon North Rim, UNESCO, Arizona, United States of America
View of the Roaring Springs Canyon cliffs from the Red Wall Bridge, Grand Canyon North Rim, UNESCO, Arizona, United States of America
The Coconino Overlook along the North Kaibab Trail at Grand Canyon North Rim, UNESCO, Arizona, United States of America
The 11th switchback along the North Kaibab Trail at Grand Canyon North Rim, UNESCO, Arizona, United States of America
Remnants of the Richinbar Mine within the Agua Fria National Monument, Black Canyon City, Arizona, USA
A sandstone hoodoo at Bryce Canyon National Park, Utah, USA
Trailhead for a sinkhole called the Keyhole Sink in Williams Arizona within the Kaibab National Forest, Arizona, USA
Volcanic cinder hills in Coconino National Forest, Arizona, USA
A rain storm over the North Rim of Grand Canyon National Park, Arizona, USA
A rain storm over the North Rim of Grand Canyon National Park, Arizona, USA
Bird petroglyph, Petrified Forest National Park, Arizona, United States of America, North America
Juvenile golden eagle (Aquila chrysaetos) in flight over snow in the winter, Yellowstone National Park, Wyoming, United States of America, North America
Fall color change amongst the trees and shrubs in Denali National Park, Alaska, United States of America, North America
Sign at the entrance to the Zion National Park at Springdale, Utah, USA.
Sandstone rock formation in the Dixie National Forest, Utah, USA. The National Forest was created in 1906.
Mountain goat (Oreamnos americanus), Glacier National Park, Montana, United States of America, North America
Walker in Quinault Rain Forest, Olympic National Park, Washington State, United States of America, North America
Round rocks in the Virgin River near The Narrows, Zion National Park, Utah, United States of America, North America
Foggy sunrise at Sunrise Point with snow, Bryce Canyon National Park, Utah, United States of America. North America
American dipper (water ouzel) (Cinclus mexicanus) standing on ice, Yellowstone National Park, Wyoming, United States of America, North America
Balanced Rock with fog, Arches National Park, Utah, United States of America, North America
Hikers amongst hoodoo formations on the Fairyland Trail in Bryce Canyon National Park, Utah, United States of America, North America
View of Thor's Hammer from the Navajo Loop Trail in Bryce Canyon National Park, Utah, United States of America, North America
Hikers amongst hoodoo formations on the Sunrise Point Trail in Bryce Canyon National Park, Utah, United States of America, North America
View of Thor's Hammer from the Navajo Loop Trail in Bryce Canyon National Park, Utah, United States of America, North America
View of Navajo sandstone formations from Angel's Landing Trail in Zion National Park, Utah, United States of America, North America
Grand Canyon view at sunset from the west side of Moran Point, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America
View of the Grand Canyon east of the historic Watch Tower, managed by the National Park Service, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America
Abandoned Train Depot in Rhyolite, a ghost town in Nye County, near Death Valley National Park, Nevada, United States of America, North America
Woman hiking around the Zion National Park, Utah, United States of America, North America
Looking down into Ubehebe crater, a Maar volcano, caused by groundwater contacting hot magma or lava, Death Valley National Park, California, United States of America, North America
Salt pan polygons at Badwater Basin, 282ft below sea level and the lowest place in North America, Death Valley National Park, California, United States of America, North America
The Charcoal Kilns, bee-hive structure, designed by Swiss engineers, built by Chinese labourers in 1879, Panamint range, Emigrant Canyon Road, Death Valley National Park, California, United States of America, North America
Shallow rooted pine (Limber pine) (Pinus flexilis), at the edge of Bryce Amphitheater, with lots of eroding hoodoos, Sunrise Point, Bryce Canyon National Park, Utah, United States of America, North America
Thor's Hammer, an iconic hoodoo on the Navajo trail, a hiking trail through Bryce Amphitheater, Bryce Canyon National Park, Utah, United States of America, North America
Pine grosbeak (Pinicola enucleator) on branch, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
A rain storm over the North Rim of Grand Canyon National Park, Arizona, USA
Panorama of a rain storm over the North Rim of Grand Canyon National Park, Arizona, USA
Rainy skies over the North Rim of Grand Canyon National Park, Arizona, USA
Palette Spring, Travertine Terraces, Mammoth Hot Springs, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Canary Spring, Travertine Terraces, Mammoth Hot Springs, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Grand Canyon of the Yellowstone River from Brink of the Lower Falls, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Artists Point looking towards Lower Falls, Grand Canyon, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Grand Canyon of the Yellowstone River, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Lamar Valley, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
American Bison (Bison bison), Little Firehole River, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Grand Prismatic Spring, Midway Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Elk (Cervus canadensis), Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Porcelain Springs, Norris Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
The cliff rim of Keyhole Sink in the Kaibab National Forest near Williams, Arizona, USA
Adult male anhinga (Anhinga anhinga), wings spread, in mangroves beside the Anhinga Trail, Everglades National Park, Florida, United States of America, North America
Beaver (Castor canadensis) swimming, Denali National Park and Preserve, Alaska, United States of America, North America
Beaver (Castor canadensis) swimming with food, Denali National Park and Preserve, Alaska, United States of America, North America
Snow-capped mountains and tundra in fall color, Denali National Park and Preserve, Alaska, United States of America, North America
Juvenile Dall Sheep (Ovis dalli) and lamb among fall color, Denali National Park and Preserve, Alaska, United States of America, North America
Grizzly bear (Ursus arctos horribilis) (Coastal brown bear) walking in a stream, Katmai National Park and Preserve, Alaska, United States of America, North America
Grizzly bear (Ursus arctos horribilis) (Coastal brown bear), Katmai National Park and Preserve, Alaska, United States of America, North America
View of Thor's Temple south of Honan Point, Grand Canyon National Park, Arizona, USA
A butte of Bentonite clay, The Painted Desert, USA
Shattered pieces of petrified wood in a sandy wash in the Jasper Forest of Petrified Forest National Park, Arizona, United States of America, North America
View of the Petrified Forest National Park from the Long Logs Trail on the south end of the park, Arizona, United States of America, North America
A Hoodoo of expansive clay called Bentonite in the Jasper Forest of Petrified Forest National Park, Arizona, United States of America, North America
Shattered pieces of petrified wood in a sandy wash in the Jasper Forest of Petrified Forest National Park, Arizona, United States of America, North America
Patches of snow in the shade of a hill in Dead Wash at Petrified Forest National Park, Arizona, United States of America
Boulder pile in a valley leading to Dead Wash, Petrified Forest National Park, Arizona, United States of America
Grand Canyon view from the north side of Horseshoe Mesa, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America
Bighorn sheep petroglyph, Petrified Forest National Park, Arizona, United States of America, North America
California ground squirrel (Citellus beecheyi), Joshua Tree National Park, California, United States of America, North America
Large pieces of petrified wood in the Jasper Forest of Petrified Forest National Park, Arizona, United States of America, North America
Indian Ruins along Cliff Springs Trail, North Rim, Grand Canyon National Park, Arizona, USA
Indian Ruins along Cliff Springs Trail, North Rim, Grand Canyon National Park, Arizona, USA