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Snowy landscape in June, at Independence Pass, elevation 12095 ft, in the Sawatch Mountains, part of the Rockies, in Aspen, Colorado, United States of America, North America

Dead tree in the desert landscape with rock formations and cliffs in the background in Monument Valley, Arizona, United States of America, North America

Straight road heading for Monument Valley, Navajo Reserve, on border of Arizona and Utah, United States of America, North America

The Grand Canyon at sunset from the South Rim, UNESCO World Heritage Site, Arizona, United States of America, North America

Maple trees in full autumn color and barn in background, Wax Orchard Road, Vashon Island, Washington State, United States of America, North America

Mount Baker from San Juan Islands, Washington State, 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

Atlantic Coastline, Acadia National Park, Mount Desert Island, Maine, New England, United States of America, North America

Nauset Light Beach, Cape Cod National Seashore, Orleans, Cape Cod, Massachusetts, New England, United States of America, North America

Tourists inspecting the large halite salt crystal formations, Devils Golf Course, Death Valley National Park, California, United States of America, North America

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

Skylight, view through cooled lava to molten lava below, with plumes of steam as lava reaches the sea beyond, Kilauea Volcano, Hawaii Volcanoes National Park, UNESCO World Heritage Site, Island of Hawaii (Big Island', Hawaii, United States of America, North America

The Racetrack Point, Death Valley National Park, California, United States of America, North America

Long exposure of star trails in night sky, Monument Valley Navajo Tribal Park, Arizona Utah border, United States of America, North America

Joshua tree, Jumbo Rocks area, Joshua Tree National Park, California, United States of America, North America

Trees in fall colours below snow covered Maroon Bell Mountains, at Aspen, Colorado, United States of America, North America

Bureau of Land Management, Three Rivers Petroglyph Site, rock carvings created by the Jornada Mogollon people during the 15th century, New Mexico, United States of America, North America

Rock strata in cliffs in Paria River Valley, Grand Staircase-Escalante National Monument, near Page, Arizona, United States of America, North America

Yucca elata plant at the White Sands National Monument, the world's largest gypsum dunefield, New Mexico, United States of America, North America

Haleakala National Park, volcanic landscape and summit visitors center, Maui Island, Hawaii, United States of America, North America

Maroon Bells reflected in Crater Lake with fall color, White River National Forest, Colorado, 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

Rocks along the coastline in the Acadia National Park, Maine, New England, United States of America, North America

Maroon Bells reflected in Maroon Lake with fall color, White River National Forest, Colorado, United States of America, North America

Maroon Bells at dawn with Maroon Lake in the fall, White River National Forest, Colorado, United States of America, North America

Glacier flowing from the Juneau Icefield to the proglacial lake, Alaska, United States of America, North America

Sign at south entrance to the Park, trees in fall colours, and the Mountain of the Sun and the Twin Brothers peaks, in the Zion National Park, Utah, United States of America, North America

Steam plumes from hot lava flowing onto beach and into the ocean, Kilauea Volcano, Hawaii Volcanoes National Park, UNESCO World Heritage Site, Island of Hawaii (Big Island), Hawaii, United States of America, North America

The Redwall Cavern, a giant cave in the walls of the Grand Canyon, seen while rafting down the Colorado River, Grand Canyon, Arizona, United States of America, North America

Spectacular coastline with waterfall, Julia Pfeiffer Burns State Park, Big Sur, California, United States of America (U.S.A.), North America

Silverswords, a plant unique to Hawaii which flowers once then dies, growing in vast crater of Haleakala, the world's largest dormant volcano, Maui, Hawaii, Hawaiian Islands, United States of America (U.S.A.), North America

Early morning light on corrugated badlands landscape at Zabriskie Point, Death Valley National Park, 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, Big Island, Hawaii, Hawaiian Islands, United States of America, North America

The American Falls with the Horseshoe Falls behind, Niagara Falls, New York State, United States of America, North America

Mount McKinley, at 20320 feet the highest peak in North America, Denali National Park, Alaska, United States of America (U.S.A.), North America

Dead orange groves, worth more as building land, near Indio, California, United States of America, North America

Lesser Snow Geese (Chen C. caerulescens), Bosque del Apache National Wildlife Refuge, New Mexico, United States of America, North America

A pine tree's roots exposed as top soil is washed away by storms, Bryce Canyon, Utah, United States of America, North America

The Old Faithful Geyser at Calistoga, erupts 60 ft high every 30 minutes, with a pressure of 1000 lbs per square foot, Napa Valley, California, United States of America, North America

Detail from the dramatic landscape of the Painted Hills, where rapid erosion has shaped colourful mineral-rich clays, John Day Fossil Beds National Monument, Oregon, United States of America, North America

Plumes of steam where the lava reaches the sea, Kilauea Volcano, Hawaii Volcanoes National Park, UNESCO World Heritage Site, Island of Hawaii (Big Island), Hawaii, United States of America, Pacific, North America

Iao Needle, also known as the Phallic stone of Kanaloa, Maui, Hawaii, United States of America, Pacific

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

Telegraph pole and flat farm landscape with barn, in Hudson, Midwest, Illinois, United States of America, North America

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

Upper Yosemite Falls cascades down the sheer granite walls of Yosemite Valley, the world's longest unbroken fall, with the famous 8842 ft Half Dome in the distance, Yosemite National Park, UNESCO World Heritage Site, California, 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

Punaluu Black Sand Beach, Island of Hawaii (Big Island), Hawaii, United States of America, Pacific, North America

The Dyke with the fall colours, Grand Mesa-Uncompahgre-Gunnison National Forest, Colorado, United States of America, North America

Rolling hills, The Palouse, Whitman County, Washington State, United States of America, North America

A visitors centre in wetlands, Everglades National Park, Florida, United States of America, North America

Eroded rocks under an overcast stormy sky, the Painted Desert, Arizona, United States of America (USA), 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

Cooled lava from recent eruption, Kilauea Volcano, Hawaii Volcanoes National Park, UNESCO World Heritage Site, Island of Hawaii (Big Island), Hawaii, United States of America, 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

Aspen trees in autumn colours, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Lesser Snow Geese (Chen C. caerulescens), Bosque del Apache National Wildlife Refuge, New Mexico, United States of America, North America

The Morning Glory Pool, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Desert landscape with rock formations in Monument Valley, Arizona, United States of America, North America

Desert landscape with rock formations in Monument Valley, Arizona, 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

Joshua trees, Mojave yucca, just before dawn, Red Rock Canyon State Park, California, United States of America (USA), North America

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

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

White Sands National Monument, world's largest gypsum dunefield, New Mexico, United States of America, North America