832-120446 - Travertine terraces of Pamukkale, UNESCO World Heritage Site, Denizli, Turkey, Asia

832-123972 - Devil's Thumb, Palette Spring Street, Lower Terraces, limestone sinter terraces, geysers, hot springs, colorful thermophilic bacteria, microorganisms, petrified trees, Mammoth Hot Springs Terraces in Yellowstone National Park, Wyoming, United States of Am

832-123976 - Boardwalk on Mound and Jupiter Spring Terrace, Main Terrace, limestone sinter terraces, geysers, hot springs, Mammoth Hot Springs Terraces in Yellowstone National Park, Wyoming, United States of America, USA

832-120442 - Travertine terraces of Pamukkale, UNESCO World Heritage Site, Denizli, Turkey, Asia

832-124058 - Emerald Pool Geyser, drainage area, colored thermophilic bacteria, microorganisms, geothermal sources, Black Sand Basin, Upper Geyser Basin, Yellowstone National Park, Wyoming, United States of America, USA

832-120447 - Travertine terraces of Pamukkale, UNESCO World Heritage Site, Denizli, Turkey, Asia

832-123968 - Drainage area of New Blue Spring Terrace, limestone sinter terraces, geysers, hot springs, colorful thermophilic bacteria, microorganisms, Mammoth Hot Springs Terraces in Yellowstone National Park, Wyoming, United States of America, USA

832-123970 - Devil's Thumb, Palette Spring Street, Lower Terraces, limestone sinter terraces, geysers, hot springs, colorful thermophilic bacteria, microorganisms, petrified trees, Mammoth Hot Springs Terraces in Yellowstone National Park, Wyoming, United States of Am

832-123974 - Minerva Spring Terrace, Lower Terraces, limestone sinter terraces, geysers, hot springs, Mammoth Hot Springs Terraces in Yellowstone National Park, Wyoming, United States of America, USA

832-124064 - Morning Glory Pool Geyser, Upper Geyser Basin, geothermal springs in Yellowstone National Park, Wyoming, United States of America, USA

832-120445 - Travertine terraces of Pamukkale, UNESCO World Heritage Site, Denizli, Turkey, Asia

832-120448 - Travertine terraces of Pamukkale, UNESCO World Heritage Site, Denizli, Turkey, Asia

832-120444 - Travertine terraces of Pamukkale, UNESCO World Heritage Site, Denizli, Turkey, Asia

832-101619 - Salt cones, Salar de Uyuni at sunset, Potosi, Bolivia, South America

832-101616 - Salt cones, Salar de Uyuni, Potosi, Bolivia, South America

832-101613 - Salt cones, Salar de Uyuni, Potosi, Bolivia, South America

832-101615 - Salt cones, Salar de Uyuni, Potosi, Bolivia, South America

832-101625 - Salt cones, Salar de Uyuni, Potosi, Bolivia, South America

832-90932 - Rainbow and Cascade Terrace, Orakei Korako Cave and Thermal Park, Taupo-Rotorua, North Island, New Zealand

832-81087 - Rainbow and Cascade Terrace, Orakei Korako Cave and Thermal Park, Taupo-Rotorua, North Island, New Zealand

832-81117 - Champagne Pool, detailed view of the edge, colour from antimon sulfides, Wai-O-Tapu Thermal Wonderland, Rotorua, North Island, New Zealand

832-81115 - Sinter terraces, detailed view of the structure, Wai-O-Tapu Thermal Wonderland, Rotorua, North Island, New Zealand

832-65089 - View across the Wadden Sea with coastal protection, groynes, Hallig Langeness, small island, at back, North Sea shore, Schleswig-Holstein Wadden Sea National Park, Dithmarschen region, Schleswig-Holstein, Germany, Europe

832-62111 - Hands holding salt, Malya, Gujarat, India, Asia

832-62107 - Simple huts right next to the saltpans where the labourers live, Malya, Gujarat, India, Asia

832-62149 - Salt production with artificial basins, created to let the water condense, Malya, Gujarat, India, Asia

832-62106 - Worker in the saltpans, Malya, Gujarat, India, Asia

832-62110 - Old technical equipment for salt production, Malya, Gujarat, India, Asia

1113-39974 - Aerial of the East Frisian island Nordeney, Lower Saxony, Germany

1116-8450 - Cliffs In Jacob's Ladder Bay; Sidmouth, Devon, England

931-346 - Humpback whale (megaptera novaeangliae) A pilot whale dives in sediment laden waters. Indonesia.

911-340 - Meltwater from the Russell Glacier that drains the Greenland Ice Sheet 26 km inland from Kangerlussuaq, Greenland, Polar Regions

911-6247 - During the November 2009 floods, Newlands Beck near Keswick changed its course and deposited millions of tons of debris on farmers fields, Lake District, Cumbria, England, United Kingdom, Europe

911-4698 - Murky river water mixing with clear sea water at Ilfracombe on the North Devon Coast, Devon, England, United Kingdom, Europe

911-1324 - A scientist studying sediment load in a stream at Moorhouse in the north Pennines, Cumbria, England, United Kingdom, Europe

911-341 - Meltwater from the Russell Glacier that drains the Greenland Ice Sheet 26 km inland from Kangerlussuaq, Greenland, Polar Regions

911-6477 - Aysgarth Falls at Aysgarth in the Yorkshire Dales National Park, Yorkshire, England, United Kingdom, Europe

911-6476 - Aysgarth Falls at Aysgarth in the Yorkshire Dales National Park, Yorkshire, England, United Kingdom, Europe

911-4695 - Seaweed washing around in the surf on coastal rocks in Ilfracombe, Devon, England, United Kingdom, Europe

911-342 - Meltwater from the Russell Glacier that drains the Greenland Ice Sheet 26 km inland from Kangerlussuaq, Greenland, Polar Regions

911-3142 - Drought at Haweswater reservoir revealing the old drowned village of Mardale, Lake District, Cumbria, England, United Kingdom, Europe

911-3143 - The A591 blocked by flood debris at Thirlmere in the Lake District, Cumbria, England, United Kingdom, Europe

911-50 - Sand dunes blown and shaped by the wind on an outwash plain below the Russell Glacier near Kangerlussuaq in Greenland, Polar Regions

911-66 - Meltwater from the Russell Glacier that drains the Greenland Ice Sheet 26 km inland from Kangerlussuaq, Greenland, Polar Regions

756-1980 - Norfolk Bay, Forestier Peninsula, Tasmania, Australia, Pacific

733-5246 - Man collecting salt, Salir de Uyuni, salt flats, Bolivia, South America

733-5245 - Man collecting salt, Salir de Uyuni, salt flats, Bolivia, South America

832-9494 - Detail, Abyss Pool in West Thumb Geyser Basin, Yellowstone National Park, Wyoming, USA

817-67371 - Sediments and ecotoxicology laboratories, Sediments tests (sludge, mud), filtering and drying, AZTI-Tecnalia, Technological Centre specialised in Marine and Food Research, Pasaia, Gipuzkoa, Euskadi, Spain.

817-98068 - Storm clouds and sun beams over Golden Canyon, Death Valley National Park, California

817-94198 - Rock formation known as 'The Wave', North Coyote Buttes,Vermillion Cliffs, Paria Wilderness, Utah, USA.

817-67368 - Sediments and ecotoxicology laboratories, Sediments tests (sludge, mud), filtering and drying, AZTI-Tecnalia, Technological Centre specialised in Marine and Food Research, Pasaia, Gipuzkoa, Euskadi, Spain.

817-74206 - Australia, New South Wales, Central Coast, Bouddi National Park, view of Bullimah Beach, an idyllic little beach on the Bouddi Peninsula at the Bouddi Coastal Walk

817-67369 - Sediments and ecotoxicology laboratories, Sediments tests (sludge, mud), filtering and drying, AZTI-Tecnalia, Technological Centre specialised in Marine and Food Research, Pasaia, Gipuzkoa, Euskadi, Spain.

817-67374 - Sediments and ecotoxicology laboratories, Sediments tests (sludge, mud), filtering and drying, AZTI-Tecnalia, Technological Centre specialised in Marine and Food Research, Pasaia, Gipuzkoa, Euskadi, Spain.

817-67373 - Sediments and ecotoxicology laboratories, Sediments tests (sludge, mud), filtering and drying, AZTI-Tecnalia, Technological Centre specialised in Marine and Food Research, Pasaia, Gipuzkoa, Euskadi, Spain.

83-9646 - Looking north along Lake Pukaki towards the Southern Alps, with Mt Sefton, left, and Mt Cook, right; (glacial sediment causes the blue of many NZ lakes), Canterbury, South Island, New Zealand

83-9640 - Glacial sediment causes blue colour in Lake Tekapo, mountains of the Southern Alps behind, Canterbury, South Island, New Zealand, Pacific