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Half Dome viewed from Glacier Point, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Half Dome, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Sunset over Grand Canyon South Rim, UNESCO World Heritage Site, Arizona, United States of America, North America

Half Dome, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Cascades, American Basin, Uncompahgre National Forest, Colorado, United States of America, North America

Joshua tree at sunset, Joshua Tree National Park, California, United States of America, North America

View of Carmel Bay and rocky shoreline at Pebble Beach, 17 Mile Drive, Peninsula, Monterey, California, United States of America, North America

View of beach and cliffs on Highway 1 near Davenport, California, United States of America, North America

Rock formations, Needles District, Canyonlands National Park, Utah, United States of America, North America

View of beach and cliffs on Highway 1 near Davenport, California, United States of America, North America

Open pit mine, the largest in the world, pit is 3800m across and 720m deep, Bingham Canyon Copper Mine, Utah, USA

Perfect example of strato-volcano, island cone left by subsidence, Crater Lake, Oregon, United States of America (U.S.A.), North America

View from the Alum Cave Bluffs trail in Great Smoky Mountains National Park, UNESCO World Heritage Site, Tennessee, United States of America (U.S.A.), North America

Sinkhole Plain, polygonal doline karst, near Mammoth Cave, Kentucky, United States of America, North America

Part of the North Unit of Badlands National Park, carved out of the prairies by rapid water erosion of sediments, South Dakota, United States of America, North America

Spectacular coastline with waterfall, Julia Pfeiffer Burns State Park, Big Sur, California, United States of America, North America

The Pu'u O'o cinder cone, the active vent on the southern flank of the Kilauea volcano, UNESCO World Heritage Site, Big Island, Hawaiian Islands, United States of America, North America

The Pu'u O'o cinder cone, the active vent on the southern flank of the Kilauea volcano, UNESCO World Heritage Site, Big Island, Hawaiian Islands, United States of America, North America

Sedimentary rocks, clay, colour banded by iron oxides, horizontal Triassic Chinle Clay, Blue Mesa, Painted Desert, Arizona, United States of America, North America

Man and woman canoeing in Mirror Lake, Chugach Mountains, Anchorage, Alaska, United States of America, North America

US Forest Service cabin, Shrode Lake, Prince William Sound, Alaska, United States of America, North America

Grand Canyon, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America

John Ford's Point and the Three Sisters and cowboy on horse, Monument Valley, border of Arizona and Utah, United States of America, North America

Photographer with Mexican giant cardon (Pachycereus pringlei), Isla San Esteban, Baja California, Mexico, North America

Mist rising from the Cataloochee ski area, near Maggie Valley, North Carolina, United States of America (USA), North America

Yellow flowering plants and loop road seen from Inferno cone, Craters of the Moon National Monument, Idaho, United States of America (U.S.A.), North America

Puu O Kila lookout on the Na Pali coast, Kauai, Hawaii, Hawaiian Islands, United States of America (U.S.A.), North America

Fall colours in taiga, spruce, willow, dwarf birch and aspen, Susitna Valley, Alaska Range, Alaska, United States of America, North America

Vulcan's Throne, the west rim, above the Colorado River, Grand Canyon, UNESCO World Heritage Site, Arizona, United States of America (USA), North America

St. Mary Lake and Wild Goose Island, Glacier National Park, Rocky Mountains, Montana, United States of America (USA), North America

Castle Geyser, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America

Old Faithful Geyser, erupts 60ft every 30 minutes, with pressure of 1000lbs per square foot, Napa Valley, California, United States of America (USA), North America

Upper and Lower Yosemite Falls, swollen by summer snowmelt, Yosemite National Park, UNESCO World Heritage Site, California, United States of America

Looking over the Appalachian mountains from the Blue Ridge Parkway in Cherokee Indian Reservation, North Carolina, United States of America (U.S.A.), North America

Man and woman canoeing in Mirror Lake, Chugach Mountains, Anchorage, Alaska, United States of America, North America

Woman looking at glaciers along the Seward Highway, Girdwood, Alaska, United States of America, North America

Bayou in swampland at Jean Lafitte National Historic Park and Preserve, south of New Orleans, Louisiana, United States of America (U.S.A.), North America

Second Beach, Olympic National Park, UNESCO World Heritage Site, Washington state, United States of America, North America

Redoubt Mountain Lodge on Crescent Lake, Lake Clark National Park and Preserve, Alaska, United States of America, North America

Erosion prevention, contoured bands of trees unfelled, also acting as fire break, Leadville, Colorado, United States of America, North America

Indian Field Creek, on Colonial Highway, near Williamsburg, Virginia, United States of America (U.S.A.), North America

Gullies eroded into the Pierre shales below Loop Road, Sage Creek wilderness, Badlands National Park, South Dakota, United States of America, North America

Grand Canyon, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Desert flora beneath Camelback Mountain, Echo Canyon Recreation Area, Paradise Valley, Phoenix, Arizona, United States of America, North America

Second Beach, Olympic National Park, UNESCO World Heritage Site, Washington state, United States of America, North America

View east from Logan Pass, Glacier National Park, Montana, United States of America (U.S.A.), North America

Saguaro cactus (Cereus giganteus), Saguaro National Park (West), Tucson, Arizona, United States of America, North America

Lower Falls of Yellowstone River, 94m high at head of canyon, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America

Nisqually Glacier in foreground, with Mount Rainier, the volcano which last erupted in 1882, 4392m high, beyond, Cascade Mountains, Washington State, United States of America (U.S.A.), North America

Sub tropical forest, Hunting Island State Park, South Carolina, United States of America, North America

Castle and Sawmill Geysers in eruption in Old Faithful Geyser Basin in winter, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America

Rural landscape, San Juan Island, San Juan Islands, Washington state, United States of America, North America