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Stromatolites, one of the most ancient life forms on earth, mats of micro-organisms that become rock-like structures through accretion of calcium carbonate, in highly saline lagoons like here in Lake Thetis, 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

Rockpool with barnacles, mussels, limpets and seaweed at Kilkee, County Clare, West Coast of Ireland

The Burren famous glaciated karst pavement landscape of limestone and dry stone walls, County Clare, West of Ireland

Bladderwrack bladder seaweed and limpets on the rocks in Kilkee, County Clare, West Coast of Ireland

Detritis debris of plastic, and polluting plasticized materials swept in from the sea litter rocks on beach in West Coast of Ireland

Bladderwrack bladder seaweed and limpets on the rocks in Kilkee, County Clare, West Coast of Ireland

Limestone pavement glaciated karst landscape and native flora in The Burren, County Clare, West of Ireland

Detritis debris of plastic, and polluting plasticized materials swept in from the sea litter rocks on beach in West Coast of Ireland

Poulnabrone Portal Dolmen megalythic burial tomb, 3800BC, in The Burren glaciated landscape, County Clare, Ireland

Wild native flower flora and limestone pavement glaciated karst landscape in The Burren, County Clare, West of Ireland

Anicca, God of Destiny holds wheel of life of Buddhist Karma, Dazu rock carvings, Mount Baoding, China

Dusk at Lizard Point in Cornwall, South West England. In the foreground is the old lifeboat station.

White-fronted tern Sterna Striata) in full flight over a beach near South Head on the Tasman Sea, North Island, New Zealand

White-fronted terns (Sterna Striata) on a beach near South Head on the Tasman Sea, North Island, New Zealand

Painted Rocks, work of the Belgian Artist Jean Veran, Aguerd Oudad, Tafraoute, Anti Atlas, Morocco, North Africa, Africa

Painted Rocks, work of the Belgian Artist Jean Veran, Aguerd Oudad, Tafraoute, Anti Atlas, Morocco, North Africa, Africa

View over the Western Wall (Wailing Wall) and the Dome of the Rock mosque, Jerusalem, Israel, Middle East

Gran Paradiso, 4061m, highest peak entirely in Italy, Gran Paradiso National Park, Aosta Valley, Italian Alps, Italy, Europe

Male Hill, 410m, overlooking western Kalahari desert, Tsodilo Hills rock art sites, UNESCO World Heritage Site, Ngamiland, Botswana, Africa

Twyfelfontein rock engravings (petroglyphs), dating from the Late Stone Age between 6000 and 2000 years, UNESCO World Heritage Site, Kunene region, Namibia, Africa

Hambukushu guide in front of famous Laurens Van der Post panel of rock art, Tsodilo Hills, UNESCO World Heritage Site, Ngamiland, Botswana, Africa

A rock carving depicts the Golden Calf of the Old Testament under Mount Sinai, at St Catherine's Monastery, Sinai Peninsula, Egypt, North Africa, Africa

Eroded calcarenite rock (cemented coral sands) with Mount Lidgbird and Mount Gower by the lagoon with the world's most southerly coral reef, on this 10km long volcanic island in the Tasman Sea, Lord Howe Island, UNESCO World Heritage Site, New South Wales, Australia, Pacific Ocean.

Devil's Marbles, the result of spheroidal weathering of strong granite beneath an ancient soil, Tennant Creek, Northern Territory, Australia, Pacific

Sunset at White Rocks (Piedras Blancas) campsite at 6200m, Aconcagua 6962m, highest peak in South America, Aconcagua Provincial Park, Andes mountains, Argentina, South America

Rio Cares carving through karst limestone valley in the Picos de Europa mountains, near Panes, Asturias, Spain, Europe

150 million year old fossilised footprint (ichnite) of theropod dinosaur in karst limestone rock, Terenes, Asturias, Spain, Europe

The Royal Urn Tomb carved out of the rock face in the ancient Nabataean city of Petra, UNESCO World Heritage Site, Jordan, Middle East

Atlantic grey seals (Halichoerus grypus) hauled out on rock, Skomer Island, Pembrokeshire, Wales, United Kingdom, Europe

A lone cyclist travels along a mountain road with trees and the Julian Alps in the background, Slovenia, Europe

Uluru (Ayers Rock), Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific

The Storr escarpment and The Old Man of Storr rock pinnacle (stack) in Trotternish Ridge with Loch Fada on the Isle of Skye, Highlands and Islands, Scotland, United Kingdom, Europe

Common seal (harbour seal) (Phoca vitulina) adult basking on rocks and seaweed by Dunvegan Castle and Loch, Isle of Skye, Inner Hebrides, Scotland, United Kingdom, Europe

Common seal (harbour seal) (Phoca vitulina) adult basking on rocks and seaweed by Dunvegan Loch, Isle of Skye, Inner Hebrides, Scotland, United Kingdom, Europe

Oystercatcher (Haematopus ostralegus) a black and white wading bird with long orange beak (bill) standing on rock on Isle of Mull, Inner Hebrides and Western Isles, Scotland, United Kingdom, Europe

Hot air balloons flying among rock formations at sunrise in the Red Valley, Goreme National Park, UNESCO World Heritage Site, Cappadocia, Anatolia, Turkey, Asia Minor, Eurasia