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  • Patterns of erosion on hillsides in Spitsbergen, Svalbard.
    110814_9924.JPG
  • Water erosion and rounded pebbles form an abstract design in the sand at Kalaloch Beach, Olympic National Park, Washington.
    101128_8559.JPG
  • Small peaks formed by erosion in the sand on Bunes Beach, Moskenesoya, Lofoten Islands, Norway.
    110924_0754.JPG
  • An endemic ohia lehua tree (Metrosideros polymorpha) grows on the steep, eroding slopes of reddish volcanic rock below the rim of Waimea Canyon, Waimea Canyon State Park, Kauai, Hawaii. According to Nicolai Barca, Field Technician for The Nature Conservancy on Kauai, "accelerated erosion was sparked by over browsing by goats. Now sun, heat, wind, water, the lack of water, continued grazing, and smothering by soil are factors leading to desertification."
    120922_3112.JPG
  • Unusual sandstone formations caused by wind erosion along the Pacific coast near the village of Mazunte, Oaxaca, Mexico on July 7, 2008.
    080707_7483.JPG
  • Waves move past a grey pebble set amid a pattern of grooves formed by water erosion in the sand on Second Beach, Olympic National Park, Washington.
    080323_7379.JPG
  • Kiya Riverman looks down a meltwater stream head cut in an ice cave in Larsbreen, Svalbard. Riverman, a glaciology graduate student, was repeat mapping the head cuts to measure their rates of erosion.
    140222_0832.JPG
  • Intertidal mudflats with drainage network outside Anchorage, Alaska.
    110523_3744.JPG
  • Windswept slopes of Hallwylfjellet, Svalbard at sunrise.
    140302_1637.JPG
  • Ripple patterns caused by sediment transport by water in the sand on Bunes Beach, Moskenesoya, Lofoten Islands, Norway.
    110924_0926.JPG
  • Ripple patterns caused by sediment transport by water in the sand on Bunes Beach, Moskenesoya, Lofoten Islands, Norway.
    110924_0869.JPG
  • Patterns caused by sediment transport by water in the sand on Horseid Beach, Moskenesoya, Lofoten Islands, Norway.
    110922_9334.JPG
  • Construction site in Tetouan, Morocco, with the Rif Mountains in the background.
    071027_7184_pan.JPG
  • Robert Hahn carries his packraft down the original river channel - now a construction site for Dam #5 - on the Nam Ou River, Laos.
    140124_121535.JPG
  • Meltwater stream head cut in an ice cave in Larsbreen, Svalbard.
    140222_0485.JPG
  • Delicate stalactites and complex strata inside an ice cave in Scott Turnerbreen, Svalbard.
    140212_9915.JPG
  • Water spills out of a culvert between the steep switchbacks of Highway 20 below Washington Pass, North Cascades Scenic Highway Corridor, Washington.
    100705_3278.JPG
  • A woman hikes the Pihea Trail on the north rim of the Alakai Plateau in Kokee State Park, Kauai, Hawaii.
    120922_3236.JPG
  • A tour boat is dwarfed by the fluted cliffs of the Na Pali Coast, Kauai, Hawaii.
    120919_1613.JPG
  • The fluted cliffs of the Na Pali Coast at sunset, Kauai, Hawaii.
    120919_1733.JPG
  • River outwash plain in Longyearbyen, Svalbard.
    110911_5870.JPG
  • Troll Bread, a rock fractured into parallel slices by frost heave, on the coast in Hornsund, Svalbard.
    110827_3963.JPG
  • Myrktjorna at the base of the eroding slopes of Gullichsenfjellet near the Polish research station of Baranowka, Svalbard.
    110819_0683.JPG
  • Ripples formed by water in the fine glacial silt deposited below Renardbreen near Calypsobyen, Svalbard.
    110817_0301.JPG
  • A debris fan and outwash plain in Spitsbergen, Svalbard.
    110814_9925.JPG
  • Ripple patterns caused by sediment transport by water in the sand on Bunes Beach, Moskenesoya, Lofoten Islands, Norway.
    110924_0922.JPG
  • Branching patterns caused by sediment transport by water in the sand on Bunes Beach, Moskenesoya, Lofoten Islands, Norway.
    110924_0901.JPG
  • Detail of pockets eroded into the rock by flash floods in Al Siq, the slot canyon entrance to Petra, Jordan.
    120216_8173.JPG
  • Honeycomb pattern salt weathering in a rock wall along the North Coast, Olympic National Park, Washington.
    090704_4494.JPG
  • Ben Hudson and Francis Rengers, students on a geology field trip with the University of Colorado, hike along a ridge at the foot of North Caineville Mesa, Utah.
    110404_0905.JPG
  • A young woman looks out from the rim of North Caineville Mesa towards Factory Butte, Utah.
    110404_0768.JPG
  • A vast field of hoodoos and high mesas at Goblin Valley State Park, Utah.
    110402_9635.JPG
  • Leif Anderson and Francis Rengers trail run through the badlands on the high plateau at Goblin Valley State Park, Utah.
    110402_9623.JPG
  • A vast field of hoodoos at Goblin Valley State Park, Utah.
    110402_9571.JPG
  • Andy Wickert, on a geology field trip with the University of Colorado, takes pictures among hoodoos in Goblin Valley State Park, Utah.
    110402_9513.JPG
  • Meltwater stream head cut in an ice cave in Larsbreen, Svalbard.
    140222_0826.JPG
  • Stephen Jennings looks down a meltwater head cut in an ice cave in Larsbreen, Svalbard.
    140222_0799.JPG
  • Meltwater stream head cut in an ice cave in Larsbreen, Svalbard.
    140222_0785.JPG
  • Stephen Jennings installs a fixed top rope on a meltwater head cut in an ice cave in Larsbreen, Svalbard.
    140222_0781.JPG
  • Stephen Jennings explores the narrow passages of an ice cave in Larsbreen, Svalbard.
    140222_0729.JPG
  • Meltwater grooves in snow near Maple Pass, North Cascades Scenic Highway Corridor, Washington.
    100703_2368_pan.JPG
  • River delta and sediment plumes in College Fjord, Prince William Sound, Alaska.
    110613_5624.JPG
  • Tourists hike the Pihea Trail on the north rim of the Alakai Plateau in Kokee State Park, Kauai, Hawaii.
    120922_3234.JPG
  • Naturalized kukui (Candlenut tree, Aleurites moluccana) grow between the fluted cliffs of the Na Pali Coast on Kauai, Hawaii. According to Katie Cassel, famed "weed warrior" and director of the Kokee Resource Conservation Program, "they seeded it out of B-51 bombers in the re-forestation projects in the 60's, so it filled valleys to the top where the seeds find the first soil and level ground to grow; otherwise it wouldn't have gotten way up there because the seeds are too big to be carried by birds."
    120919_1761.JPG
  • A tour boat is dwarfed by the fluted cliffs of the Na Pali Coast, Kauai, Hawaii.
    120919_1607.JPG
  • Fractured rock in Hornsund, Svalbard.
    110830_4182.JPG
  • Fractured rock on the coast in Hornsund, Svalbard.
    110830_4181.JPG
  • Fractured rock erodes in jagged blocks on the coast in Hornsund, Svalbard.
    110825_1716.JPG
  • An abandoned building on the coast at Calypsobyen, Svalbard, site of a coal mining operation erected by the British Northern Exploration Company in the early 1900s.
    110817_0339.JPG
  • An abandoned building on the coast at Calypsobyen, Svalbard, site of a coal mining operation erected by the British Northern Exploration Company in the early 1900s.
    110817_0338.JPG
  • Ripple patterns caused by sediment transport by water in the sand on Bunes Beach, Moskenesoya, Lofoten Islands, Norway.
    110924_0927.JPG
  • Patterns caused by sediment transport by water in the sand on Bunes Beach, Moskenesoya, Lofoten Islands, Norway.
    110924_0905.JPG
  • Patterns caused by sediment transport by water in the sand on Bunes Beach, Moskenesoya, Lofoten Islands, Norway.
    110924_0894.JPG
  • Patterns caused by sediment transport by water in the sand on Bunes Beach, Moskenesoya, Lofoten Islands, Norway.
    110924_0888.JPG
  • Sedimentary patterns in the sand on Horseid Beach, Moskenesoya, Lofoten Islands, Norway.
    110922_9338.JPG
  • Two donkeys walk inside a canyon with intricate patterns in Petra, Jordan.
    120216_8491.JPG
  • University of Colorado geomorphology professor Robert Anderson walks with a student through the mancos shale badlands near Factory Butte, Utah.
    100315_1191.JPG
  • Aerial view of Basin and Range Province topography, alternating mountains and valleys, in Nevada.
    101129_8926.JPG
  • Detail of tall hoodoos at Goblin Valley State Park, Utah.
    110402_9679.JPG
  • Francis Rengers and Ben Hudson run among the hoodoos in Goblin Valley State Park, Utah.
    110402_9662.JPG
  • A vast field of hoodoos and high mesas at Goblin Valley State Park, Utah.
    110402_9638_pan_crop.JPG
  • A hiker stands on the summit of a high mesa overlooking the vast field of hoodoos at Goblin Valley State Park, Utah.
    110402_9585_pan.JPG
  • Vast field of hoodoos at Goblin Valley State Park, Utah.
    110402_9490.JPG
  • Vast field of hoodoos at Goblin Valley State Park, Utah.
    110402_9489.JPG
  • Wind swept snow crust on a high ridge below Pawnee Peak, Indian Peaks Wilderness, Rocky Mountains, Colorado.
    101031_7225.JPG
  • Unusual rock formations are carved in the bedrock by wave action on Second Beach, Olympic National Park, Washington.
    080324_7531.JPG
  • Stephen Jennings throws down a fixed top rope on a meltwater head cut in an ice cave in Larsbreen, Svalbard.
    140222_0800.JPG
  • Stephen Jennings installs a fixed top rope on a meltwater head cut in an ice cave in Larsbreen, Svalbard.
    140222_0782.JPG
  • Patterns caused by sediment transport by water in the sand on Bunes Beach, Moskenesoya, Lofoten Islands, Norway.
    110924_0850.JPG
  • Detail of cavities eroded into the sandstone walls of Little Wild Horse Canyon, San Rafael Swell, Utah.
    110403_0140.JPG
  • Hikers stand on the summit of a high mesa overlooking the vast field of hoodoos at Goblin Valley State Park, Utah.
    110402_9568.JPG
  • Striking erosion patterns in the sand at the mouth of Kalaloch Creek, Olympic National Park, Washington.
    101128_8616.JPG
  • Water erosion and a rounded pebble form an abstract design in the sand at Kalaloch Beach, Olympic National Park, Washington.
    101128_8558.JPG
  • Braided patterns made by erosion in the sand entangle a small pebble on Shi Shi Beach, Olympic National Park, Washington.
    050323_2508.JPG
  • Water erosion carves clear hydrological pathways into the mancos shale badlands near Factory Butte, Utah.
    100315_1123.JPG
  • Detail of unusual rock formations caused by wind erosion on the rim of a canyon system near Factory Butte, Utah.
    100315_0892.JPG
  • Rain falling on the summit of Kauai, Hawaii, one of the wettest places on Earth, falls over 900 meters (3000 feet) into the Blue Hole, a deep box canyon formed by erosion below Mount Waialeale.
    120919_1510.JPG
  • Waves crash into rocky cliffs along the Pacific coast near the village of Mazunte, Oaxaca, Mexico on July 7, 2008. Sandstone in the foreground exhibits unusual forms caused by wind erosion.
    080707_7469.JPG
  • University of Colorado geology graduate student Francis Rengers installs a LiDAR laser scanning target for his research studying stream erosion at the Plains Conservation Center boundary near Strasburg, Colorado.
    111128_2048.JPG
  • Aerial view of sparse residential development and unpaved roads causing increased soil erosion and sediment runoff in the outskirts of Phoenix, Arizona.
    100130_8608.JPG
  • Zach Podell-Eberhardt holds up the pieces of a bizarre rock, riddled with holes formed by erosion, found on the beach between Sand Point and Cape Alava on a backpack of the North Coast, Olympic National Park, Washington.
    090706_4806.JPG
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