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Thrombolites, a variey of microbialite or living rock that produce oxygen and deposit calcium carbonate, similar to some of the earliest fossil forms of life found on Earth, Lake Clifton, Yalgorup National Park, Mandurah, Western Australia, Australia, Pacific
Tourist walks round Masaya crater, Santiago crater, Park National Volcan Masaya, Masaya, Nicaragua, Central America
Rock pillars formed by erosion of thick hard layer of calcrete over soft limestone, The Pinnacles Desert, Nambung National Park, near Cervantes, Dandaragan Shire, Western Australia, Australia, Pacific
Rock pillars formed by erosion of thick hard layer of calcrete over soft limestone, The Pinnacles Desert, Nambung National Park, near Cervantes, Dandaragan Shire, Western Australia, Australia, Pacific
Hikers taking a rest above the Skaftafellsjokull glacier, Skaftafellsa glacial river in the background, in Skaftafell National Park, south-east Iceland (Austurland), Iceland, Polar Regions
Huliba limestone caves, Arikok National Park, Aruba (Dutch Antilles), West Indies, Caribbean, Central America
Hound Tor, Dartmoor National Park, Devon, England, United Kingdom, Europe
Uluru (Ayers Rock), Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
The Olgas (Kata Tjuta) at sunrise, Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
Llamas grazing before Volcanoes Parinacota and Pomerape, Lauca National Park, Chile, South 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
The Perito Moreno Glacier, rare in that it is advancing rather than retreating, Los Glaciares National Park, UNESCO World Heritage Site, Patagonia, Argentina, South America
The Morning Glory Pool, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
The Morning Glory Pool, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
View from limestone pavement across the Jamison Valley in the Blue Mountains National Park where the blue haze is caused by eucalyptus oil, near Katoomba, UNESCO World Heritage Site, New South Wales (N.S.W.), Australia, Pacific
Part of Nourlangie Rock, sacred aboriginal shelter and rock art site, Kakadu National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
Scree slope and limestone vale, near Conistone, Yorkshire Dales National Park, North Yorkshire, England, United Kingdom, Europe
The Pinnacles, Nambung National Park, Cervantes, Western Australia, Australia, Pacific
Remarkable Rocks, Flinders Chase National Park, Kangaroo Island, South Australia, Australia, Pacific
Hikers near Emerald Lakes on the Tongariro Crossing, Tongariro National Park, UNESCO World Heritage Site, the oldest national park in New Zealand, Taupo Volcanic Zone, North Island, New Zealand, Pacific
Thrombolites, a variey of microbialite or living rock that produce oxygen and deposit calcium carbonate, similar to some of the earliest fossil forms of life found on Earth, Lake Clifton, Yalgorup National Park, Mandurah, Western Australia, Australia, Pacific
Late winter hikers on Tongariro crossing, Mount Ngauruhoe and South Crater, Taupo, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific
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
Malham Cove, Malham, Yorkshire Dales National Park, North Yorkshire, England, United Kingdom, Europe
Irazu volcano, Irazu Volcano National Park, Cartago Province, Costa Rica, Central America
A general view of the Athabasca Glacier, a six kilometre tongue of ice flowing from the Columbia Icefield. It is the best-known glacier in the Canadian Rockies and is situated in Jasper National Park, Alberta, Canada.
Castle Geyser, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America
Mount Fuji (3776m), Owakidani geothermal park, Hakone, Honshu Island, Japan, Asia
Hikers near Emerald Lakes on the Tongariro Crossing, Tongariro National Park, UNESCO World Heritage Site, the oldest national park in New Zealand, Taupo Volcanic Zone, North Island, New Zealand, Pacific
Uluru (Ayers Rock), Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
Remarkable Rocks, Flinders Chase National Park, Kangaroo Island, South Australia, Australia, Pacific
Irregular blocky lava (a'a) and cinder cones of the volcanic landscape of Timanfaya National Park, Lanzarote, Canary Islands, Spain, Atlantic Ocean, Europe
Uluru (Ayers Rock), Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
Hiking trail and rocky peaks on Cradle Mountain on the Overland Track, Cradle Mountain Lake St. Clair National Park, part of Tasmanian Wilderness, UNESCO World Heritage Site, Tasmania, Australia, Pacific
Devils Punchbowl Falls, 131m high, on walking track in mountain beech forest, Arthur's Pass National Park, Southern Alps, Westland, South Island, New Zealand, Pacific
People canoeing near Tham Law (tube cove), Ao Phang-Nga Marine Park, Phang Nga province, Thailand, Southeast Asia, Asia
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
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
The Domes, Bungle Bungle, Purnululu National Park, UNESCO World Heritage Site, Kimberley, Western Australia, Australia, Pacific
Views from the Nadab lookout, at the sacred Aboriginal site of Ubirr, Kakadu National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
Late winter hiker on Tongariro Crossing, Mount Ngauruhoe and South Crater, Tongariro National Park, UNESCO World Heritage Site, Taupo, South Auckland, North Island, New Zealand, Pacific
Lake of the Clouds, Carlsbad Caverns National Park, UNESCO World Heritage Site, New Mexico, 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
Rocky amphitheatre with pool, at head of Cathedral Gorge, Purnululu National Park, UNESCO World Heritage site, Bungle Bungle, Kimberley, Western Australia, Australia, Pacific
Peyto Lake, Mount Patterson and Mistaya valley, Banff National Park, UNESCO World Heritage Site, Alberta, Canada, North America
Grand Canyon, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Uluru (Ayers Rock), Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
Yaga River and karst limestone cliffs of Escuain gorge, Ordesa and Monte Perdido National Park, Huesca, Aragon, Spain, Europe
The Perito Moreno Glacier, rare in that it is advancing rather than retreating, Los Glaciares National Park, UNESCO World Heritage Site, Patagonia, Argentina, South America
Gullies eroded into the Pierre shales below Loop Road, Sage Creek wilderness, Badlands National Park, South Dakota, United States of America, North America
Norber erratics near Austwick, erratic boulders left on limestone pavement by erosion, Yorkshire Dales National Park, Yorkshire, England, United Kingdom, Europe
Red sand dunes, up to 300m, Sossusvlei, Namib-Naukluft Desert Park, Namibia, Africa
Uluru (Ayers Rock), Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
The Olgas, Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
Karst limestone peaks within Ordesa and Monte Perdido National Park, Spanish Pyrenees, Huesca, Aragon, Spain, Europe
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
Fossil logs 200 million years old scattered over desert floor in National Park, Petrified Forest National Park, Arizona, United States of America (U.S.A.), North America
Dormant volcano, Mount Ngauruhoe, Tongariro National Park, UNESCO World Heritage Site, Taupo, South Auckland, North Island, New Zealand, Pacific
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
Uluru (Ayers Rock), Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
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
Hikers at Red Crater on the Tongariro Crossing, Tongariro National Park, the oldest national park in the country, UNESCO World Heritage Site, Taupo Volcanic Zone, North Island, New Zealand, Pacific
Dry river and beehive-like mounds in the Purnululu National Park, UNESCO World Heritage Site, Bungle Bungle mountain range, Western Australia, Australia, Pacific
Salt and algal deposits at Lake Clifton, one of a string of coastal lakes south of Mandurah, Yalgorup National Park, Mandurah, Western Australia, Australia, Pacific
Snow on pinnacles and rock formations in the Bryce Canyon National Park in Utah, 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
The Screes, Lake Wastwater, Wasdale, Lake District National Park, Cumbria, England, United Kingdom, Europe
The Olgas, Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
Poas Volcano, Poas Volcano National Park, Costa Rica, Central America
Uluru (Ayers Rock), Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
Balanced Rock, a pinnacle of red sandstone caused by erosion, in the Arches National Park in Utah, United States of America, North America
Tourists cross flood scoured rocks, past typical formations, Purnululu National Park, UNESCO World Heritage Site, Bungle Bungle, Kimberley, Western Australia, Australia, Pacific
Aerial view of peak of Mount Cook, Mount Cook National Park, Southern Alps, Canterbury, South Island, New Zealand, Pacific
Hikers walking through a lava field on the Tongariro Crossing, Tongariro National Park, the oldest national park in the country, UNESCO World Heritage Site, Taupo Volcanic Zone, North Island, New Zealand, Pacific
Uluru (Ayers Rock), Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
Tourists viewing the Morning Glory Pool, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Hoodoos, Bryce amphitheater, Bryce Canyon National Park, Utah, United States of America (U.S.A.), North America
Norber erratics near Austwick, erratic boulders left on limestone pavement by erosion, Yorkshire Dales National Park, Yorkshire, England, United Kingdom, Europe
Poas Volcano, Poas Volcano National Park, Costa Rica, Central America
Oxara River tumbles down the Almannagja cliff face at Oxarafoss, Thingvellir National Park, UNESCO World Heritage Site, south-west Iceland (Sudurland), Iceland, Polar Regions
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
Uluru (Ayers Rock), Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
Garibaldi Glacier, Darwin National Park, Tierra del Fuego, Patagonia, Chile, South America
Bromo-Tengger-Semeru National Park at dawn, island of Java, Indonesia, Southeast Asia, Asia
Death Vlei, Namib Naukluft Park, Namibia, Africa
Uluru (Ayers Rock), Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
The Olgas, Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
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
Anisclo Canyon and eroded karst limestone Mondoto peak, Ordesa and Monte Perdido National Park, Huesca, Aragon, Spain, Europe
Echinus Geyser, erupts every hour in Norris Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America
Blisters measuring about 10 cm across in boiling mud pool, Mud volcano, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America
Moraine Lake with mountains that overlook Valley of the Ten Peaks, Banff National Park, Canada, North America
Hot water in pools on calcite terraces deposited by Mammoth Hot Springs, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America
Dinosaur Tracks, Clayton Lake State Park, New Mexico, United States of America, North America
Monument Valley Navajo Tribal Park, Utah Arizona border, United States of America, North America
Monument Valley Navajo Tribal Park, Utah Arizona border area, United States of America, North America
Norber erratics near Austwick, erratic boulders left on limestone pavement by erosion, Yorkshire Dales National Park, Yorkshire, England, United Kingdom, Europe
Sand dunes in the Great Sand Dunes National Park and Preserve with Sangre Cristo Mountains in the background, Colorado, United States of America, North America
Thor's Hammer near Sunset Point, Bryce Canyon National Park, Utah, United States of America, North America
Delicate Arch, Arches National Park, Moab, Utah, United States of America, North America