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Petrified Forest National Park, Blue Mesa, Blue Mesa Trail, sedimentary layers of bluish bentonite clay

Sedimentary layers of bluish bentonite clay with petrified wood, Blue Mesa Trail, Blue Mesa, Petrified Forest National Park, Arizona, United States of America, North America

Sedimentary layers of bluish bentonite clay, The Tepees, Petrified Forest National Park, Arizona, United States of America, North America

Sedimentary layers of bluish bentonite clay, Blue Mesa Trail, Blue Mesa, Petrified Forest National Park, Arizona, United States of America, North America

Cracks in eroded badlands, Badlands National Park, South Dakota, United States of America, North America

Japanese warning sign on the crater rim of Mount Naka active volcano, Mount Aso, Kyushu, Japan, Asia

Golf course in a volcanic crater, Heimaey Island, Vestmannaeyjar, volcanic Westman Islands, Iceland, Polar Regions

Tourists exploring White Island Volcano, an active volcano in the Bay of Plenty, North Island, New Zealand, Pacific

Lomaki Pueblo, inhabited from approximately 1100 AD to 1250 AD, Wupatki National Monument, Arizona, United States of America, North America

Mud pots, fumaroles and dormant Volcan Santa Clara at the San Jacinto volcanic thermal area north of Leon, Leon, Nicaragua, Central America

Aerial view of lagoon and karst limestone formations in Wayag Island, Raja Ampat, West Papua, Indonesia, Southeast Asia, Asia

Otter Point at sunset, Cape Maclear, Lake Malawi National Park, UNESCO World Heritage Site, Malawi, Africa

Karst limestone formations and lagoon in Wayag Island with the photographer's kayak, Raja Ampat, West Papua, Indonesia, Southeast Asia, Asia

Karst limestone formations and lagoon in Wayag Island with the photographer's kayak, Raja Ampat, West Papua, Indonesia, Southeast Asia, Asia

Colourful patterns created by sea erosion on rocks revealed at low tide on Spittal Beach, Berwick-upon-Tweed, Northumberland on border between England and Scotland, United Kingdom, Europe

Hikers descend the curving South Kaibab trail in Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

The Bowerman's Nose granite pillar surrounded by light winter snow, Dartmoor, Devon, England, United Kingdom, Europe

Traditional sea salt production, Salinas de Janubio, Lanzarote, Canary Islands, Spain, Atlantic, Europe

Malpais badlands volcanic landscape looking northeast from Los Hervideros, Parque Natural Los Volcanes, near Yaiza, Lanzarote, Canary islands, Spain, Atlantic, Europe

Montana de Medio, mountain, Los Ajaches mountain range, Lanzarote, Canary Islands, Spain, Atlantic, Europe

Grape vines growing in black volcanic pits in La Geria, Lanzarote, Canary Islands, Spain, Atlantic, Europe

Atlantic coast in south west corner, Los Charcones, Caleta Negra bay, near Playa Blanca, Lanzarote, Canary islands, Spain, Atlantic, Europe

Walkway over lava field, Timanfaya Volcano Interpretation and Visitors' Centre, Lanzarote, Canary Islands, Spain, Atlantic, Europe

Snow dusted Kes Tor showing Dartmoor's largest rock basin, Dartmoor National Park, Devon, England, United Kingdom, Europe

Ammonite fossils revealed in slate rock ledges at low tide, Kilve, Somerset, England, United Kingdom, Europe

Glaciar Frances, French Valley (Valle Frances), Torres del Paine National Park, Patagonia, Chile, South America

Blackchurch Rock and rocky ledges at twilight, Mouthmill Beach, North Devon, England, United Kingdom, Europe

Expansive open-pit mine with winding roads under a cloudy sky, North Yorkshire, England, United Kingdom, Europe

Hot pool on the Rainbow Terrace at Orakei Korako Geyserland, The Hidden Valley, North Island, New Zealand, Pacific

A lone photographer stands perched on a rock silhouetted against the dawn orange sky at Yaki Point, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Looking down onto the inner canyon and Colorado River from Mohave Point as it flows through the Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Kasha-Katuwe Tent Rock National Monument, tent like rock formations, from volcanic eruptions 6 to 7 million years ago, New Mexico, United States of America, North America

Scenic limestone valley with a gravel path leading through, under a partly cloudy sky, North Yorkshire, England, United Kingdom, Europe

Scenic limestone cliffs with grassy slopes and rocky terrain under a cloudy sky in a mountainous region, North Yorkshire, England, United Kingdom, Europe

Acid Crater Lake, White Island Volcano, an active volcano in the Bay of Plenty, North Island, New Zealand, Pacific

Canyon de Chelly National Monument, Mummy Cave Ruins, Arizona, United States of America, North America

Canyon de Chelly National Monument, Mummy Cave Ruins, Arizona, United States of America, North America

Canyon de Chelly National Monument, View from the Whitehouse Overlook, Arizona, United States of America

Canyon de Chelly National Monument, Mummy Cave Ruins, Arizona, United States of America, North America

Canyon de Chelly National Monument, Mummy Cave Ruins, Arizona, United States of America, North America

Olive tree in semi desert area near Rodalquilar, Cabo de Gata natural park, Almeria, Andalusia, Spain, Europe

Pool in slick rock reflecting first light on a sandstone hill, Zion National Park, Utah, United States of America, North America

Rock formation at the 50 million year old Stone Forest (Pobiti Kamani), protected national monument, in Varna Province, Bulgaria, Europe

Rock formation at the 50 million year old Stone Forest (Pobiti Kamani), protected national monument, in Varna Province, Bulgaria, Europe

Rock formation at the 50 million year old Stone Forest (Pobiti Kamani), protected national monument, in Varna Province, Bulgaria, Europe

Oia village perched on Santorini caldera rim, Oia, Santorini, Cyclades Islands, Greek Islands, Greece, Europe

Waterfalls cascade down the karst limestone cliffs of the Cirque de Gavarnie, Pyrenees National Park, Hautes-Pyrenees, France, Europe

Basalt cliffs and rock stack, Halsenifs Hellir Beach, near Vik i Myrdal, South Iceland, Iceland, Polar Regions

Circular boulders at Porth Nanven beach, with The Brisons island on the horizon, Cornwall, England, United Kingdom, Europe

Johnston Canyon Creek, Banff National Park, Alberta, UNESCO World Heritage Site, Canada, North America

First light glows on the mountains of the Seaward Kaikoura ranges, Kaikoura, South Island, New Zealand, Pacific

Dawn sky above Milford Sound, Fiordland National Park, UNESCO World Heritage Site, South Island, New Zealand, Pacific

Pink twilight on the rocky shores of Mupe Rocks in winter, Jurassic Coast, UNESCO World Heritage Site, Dorset, England, United Kingdom, Europe

Rocky seashore at Priest's Cove beneath Cape Cornwall, St. Just, Cornwall, England, United Kingdom, Europe

Looking across Zawn Trevilley from the clifftops at Pordenack Point towards Carn Boel, Land's End, Cornwall, England, United Kingdom, Europe

Waves crash over the rocks at Godrevy Point, looking out towards the lighthouse on Godrevy Island, Cornwall, England, United Kingdom, Europe

Waves crash over the rocks of Godrevy Point at sunset, looking towards Godrevy Lighthouse, Cornwall, England, United Kingdom, Europe