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

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

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

Hiker, Napali coast, Kokee State Park, Kauai Island, Hawaii, United States of America, North America

Trees in fall colours in woods in the Acadia National Park, Maine, New England, United States of America, 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

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

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

Area near Loft Mountain, Shenandoah National Park, Virginia, United States of America (U.S.A.), North America

Wood River and Sawtooths, Sawtooth National Recreation Area, Idaho, United States of America (U.S.A.), North 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

Aerial view of the interior of the island of Kauai, including Waimea Canyon, Hawaii, United States of America, North America

Rare winter snowfall, Joshua Tree National Park, California, 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

Midway Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Beaver Pond and Dam with Teton Range, Grand Tetons National Park, Wyoming, United States of America, North America

Aerial view over woodland and rolling hills in fall colours, White Mountain National Park, New Hampshire, New England, United States of America, North America

Part of the vast crater of 10023 ft Haleakala, the world's largest dormant volcano, seen from Sliding Sands trail, Maui, Hawaii, Hawaiian Islands, United States of America (U.S.A.), North America

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

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

Lava flow, Kilauea, Hawaii Volcanoes National Park, UNESCO World Heritage Site, Island of Hawaii (Big Island), Hawaii, United States of America, North America

Hikers on arch rock formation in Bryce Canyon Amphitheater, Bryce Canyon National Park, Utah, United States of America, North America

Hikers on arch rock formation in Bryce Canyon Amphitheater, Bryce Canyon National Park, Utah, United States of America, North America

Maple tree in fall colours in the White Mountains, New Hampshire, New England, United States of America, North America

Hills near Loft Mountain in autumn in the Shenandoah National Park, Virginia, United States of America, North America

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

Joshua trees near Death Valley, Joshua Tree National Park, California, United States of America, 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

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

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

Eruption of Castle Geyser with thermophilic bacterica mats in foreground, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Mountain stream beside Going to the Sun road, near Logan Pass, Glacier National Park, Montana, United States of America, North America

Hiker, Napali coast, Kokee State Park, Kauai Island, Hawaii, United States of America, North America

Snow on pinnacles and rock formations in the Bryce Canyon National Park in Utah, United States of America, North America

The Clark Fork River in the fall, at Tarkio, Rocky Mountains, west Montana, 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

View of Waipio Valley, Island of Hawaii (Big Island), Hawaii, United States of America, Pacific, North America

Skylight, view through cooled lava to molten lava below, Kilauea Volcano, Hawaii Volcanoes National Park, Island of Hawaii (Big Island', Hawaii, United States of America, North America

The two great 13000ft volcanic peaks of Mauna Loa on right, and Mauna Kea on the Big Island seen from the top of the Haleakala volcano, Maui, Hawaii, Hawaiian Islands, United States of America, Pacific, North America

Las Vegas Ski and Snowboard Resort, Mount Charleston, near Las Vegas, Nevada, United States of America, North America

Boulder on rocky arid landscape in the Tioga Pass area of Nevada, United States of America, North America

Meadow of glacier lilies, with the High Rocky Mountains behind, Glacier National Park, Montana, United States of America, North America

Aerial view over Linville Falls, on the Linville River near the Blue Ridge Parkway, Appalachian Mountains, North Carolina, United States of America, North America

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

Spirit Lake in the landscape north of Mount St. Helens devastated by the 1980 eruption, Mount St. Helens National Volcanic Monument, Washington State, United States of America (U.S.A.), North America

Reflections in Snake River, Grand Tetons National Park, Wyoming, United States of America, North America

Aerial view of Lake Mead with surrounding arid landscape in Nevada, United States of America, North America

Aerial view of Siple Station, main base is 40ft under the ice, United States Antarctic Program, Antarctica, Polar Regions

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

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

Grand Canyon at sunset, UNESCO World Heritage Site, Arizona, United States of America, North America

Chatham Lighthouse Beach, Chatham, Cape Cod, Massachusetts, New England, United States of America, North America

Kalmus Park Beach, Hyannis, Cape Cod, Massachusetts, New England, United States of America, North America

Second Beach, Olympic National Park, UNESCO World Heritage Site, Washington state, 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

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

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

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

Reflections of trees in fall colours and cliffs of Zion, in a lake, near the Zion National Park, Springdale, Utah, United States of America, North America

Close-up of the limestone terraces formed by volcanic water depositing six inches of calcium carbonate a year, Mammoth Hot Springs and Terraces, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, 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

Ryan Lake and some of the millions of trees north of Mount St. Helens flattened by the eruption of 1980, Mount St. Helens National Volcanic Monument, Washington State, United States of America (U.S.A.), North America

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

The Racetrack Point, 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

Cake Rock on Rialto Beach, Olympic National Park, UNESCO World Heritage Site, Washington State, United States of America, North America

Lush vegetation including palm trees on the banks of a creek in Palm Canyon, Palm Springs, California, United States of America, North America

Rocks in the South Fork of the Kings River, with trees and crags in the background, in Cedar Gorge, Kings Canyon National Park, California, United States of America, North America

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

Lava dome in crater seen from rim, Mount St. Helens after 1980 eruption, with Spirit Lake and Mount Rainier in the distance, Mount St. Helens National Volcanic Monument, Washington State, United States of America (U.S.A.), North America

Northern coniferous forest around Lake Skilak on the Kenai Peninsula, Alaska, United States of America (USA), North America

Hoodoos, Bryce amphitheater, Bryce Canyon National Park, Utah, United States of America (U.S.A.), North America

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

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

Monterey County, Big Sur Highway No. 1 south of Carmel, California, United States of America, North America

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