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Morning Glory Pool, a geothermal pool, colours are due to algae at temperature bands, hotter below, Yellowstone National Park, Wyoming, USA
Female tourist on boardwalk by the Morning Glory Pool, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Vibrant green algae exposed at low tide at Tregardock Beach, North Cornwall, England, United Kingdom, Europe
Seaweed washed up on Studland Bay shore at dawn, with Old Harry Rocks in the distance, Studland, Dorset, England, United Kingdom, Europe
Saltwater (estuarine) crocodile (Crocodylus porosus), Sarawak, Borneo, Malaysia, Southeast Asia, Asia
Dusk over Penmon Point Lighthouse and Puffin Island, Isle of Anglesey, Wales, United Kingdom, Europe
Algae lined rockpools on the coast at Gasadalur on the island of Vagar, Faroe Islands, Denmark, Europe
Algae covered rocks at sunrise at Church Ope Cove, Portland, Jurassic Coast, UNESCO World Heritage Site, Dorset, England, United Kingdom, Europe
The rocky shore of West Weares on Portland, looking towards Chesil Beach, Jurassic Coast, UNESCO World Heritage Site, Dorset, England, United Kingdom, Europe
Stair Hole near to Lulworth Cove, Jurassic Coast, UNESCO World Heritage Site, Dorset, England, United Kingdom, Europe
Edible algae provides a pink hue to the Hutt Pink Lagoon, Port Gregory, Western Australia, Australia, Pacific
Edible algae provides a pink hue to the Hutt Pink Lagoon, Port Gregory, Western Australia, Australia, Pacific
Pool runoff of orange bacteria and algae (Therophiles), Grand Prismatic Pool, Midway Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
The shell of Hawaiian reef lobster (Enoplometopus occidentalis), covered in algae and parasitic barnacles, Hawaii, United States of America, Pacific, North America
A garibaldi (Hypsypops rubicundus) in a forest of giant kelp off Catalina Island, California, United States of America, North America
Algae covered pebbles at Church Ope Cove at dawn Portland, Jurassic Coast, UNESCO World Heritage Site, Dorset, England, United Kingdom, Europe
Traditional sea salt production, Salinas de Janubio, Lanzarote, Canary Islands, Spain, Atlantic, Europe
Castle Geyser erupting, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Morning Glory Pool, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Saint Nazaire Cathedral and Pont Vieux (Old Bridge), Beziers, Herault, Languedoc-Roussillon, France, Europe
Sabellaria alveolata honeycomb worm reef, Mimid beach, Sidi Boufdail, Mirleft, Morocco, North Africa, Africa
Grand Prismatic Spring, Midway Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Female tourist on boardwalk by the Morning Glory Pool, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Algae coated rock pools at sunset on the basalt rock ledge seashore of Gjogv in the Faroe Islands, Denmark, Europe
Waterfall near the Old Man of Storr on the Isle of Skye, Inner Hebrides, Scotland, United Kingdom, Europe
Excelsior Pool, Midway Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Small stream cascading over rocks in mountains of Kilauea, Kauai, Hawaii, United States of America, Pacific
Grand Prismatic Spring, Midway Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Sapphire Pool, Biscuit Basin, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Crested Pool, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Trees covered by orange trentepohlia, Waiotapu Thermal Area, Rotorua, North Island, New Zealand, Pacific
Wooden boardwalk and cyanobacteria thermophile formations on Geyser Hill, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Elegant lichens cover the rocks at Gnalodden, Hornsund, Spitsbergen, Svalbard, Arctic, Norway, Europe
Tourists on boardwalk over the mineral runoff from Grand Prismatic Spring, Midway Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Water rich in blue-green algae (cyanobacteria), mineral salts and fine silica mud at the geothermal spa that owes its existence to the Svartsengi geothermal power plant, Blue Lagoon, near Reykjavik, Iceland, Polar Regions
Water rich in blue-green algae (cyanobacteria), mineral salts and fine silica mud at the geothermal spa that owes its existence to the Svartsengi geothermal power plant, Blue Lagoon, near Reykjavik, Iceland, Polar Regions
Water rich in blue-green algae (cyanobacteria), mineral salts and fine silica mud at the geothermal spa that owes its existence to the Svartsengi geothermal power plant, Blue Lagoon, near Reykjavik, Iceland, Polar Regions
Morning Glory Pool, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Grand Prismatic Spring, Midway Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Aerial view by drone of swirls of green algae in a freshwater lake, Roadford Lake, Devon, England, United Kingdom, Europe
Grand Geyser erupting over sinter terrace, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
The endemic Galapagos marine iguana (Amblyrhynchus cristatus) feeding underwater in the Galapagos, UNESCO World Heritage Site, Ecuador, South America
The Lindblad Expedition ship National Geographic Explorer in the Svalbard Archipelago, Norway, Arctic, Europe
A cute red-spotted blenny, Blenniella chrysospilos, looks out from its protective home on a coral reef in Indonesia. This combtooth blenny feeds on algae.
The endemic Galapagos marine iguana (Amblyrhynchus cristatus) feeding on algae at low tide in the Galapagos, UNESCO World Heritage Site, Ecuador, South America
A myriad of hard and soft corals, as well as tropical reef fish at Vatu-I-Ra Conservation Park on Viti Levu, Fiji, South Pacific, Pacific
A rocky shoreline covered with clusters of blue-black mussels. The mussels cling tightly to the rocks, creating a textured surface. Some green algae is visible in the water pools among the rocks, reflecting sunlight.
Tourists on the boardwalk around the Grand Prismatic Spring, Midway Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
California sea lions (Zalophus californianus), stampeding on the beach in Puerto Refugio, Baja California, Sea of Cortez, Mexico, North America
The intertidal zone of the Quantock Coast, West Somerset, contains an abundance of geology and wildlife. It is a Site of Special Scientific Interest (SSSI) and is of international geological importance.
A small red starfish clings to coralline algae in Wakatobi National Park, Indonesia. This remote region is known for its incredible marine biodiversity and gorgeous reefs.
Vibrant sea cucumbers, tunicates, hydroids, and other invertebrates cling to a reef in Raja Ampat, Indonesia.
Vibrant pink water lily blooming in a tranquil pond with green algae and lily pads, reflecting serene beauty in nature at Kew Gardens, London, England, United Kingdom, Europe
Castle Geyser erupting, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
View towards islands of Harris and Lewis from Taransay, Outer Hebrides, Scotland, United Kingdom, Europe
Grand Prismatic Spring and Excelsior Pool behind, Midway Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
An adult green sea turtle (Chelonia mydas), underwater in Fernandina Island, Galapagos, Ecuador, South America
An adult green sea turtle (Chelonia mydas), underwater in Fernandina Island, Galapagos, Ecuador, South America
Adult green sea turtle (Chelonia mydas), feeding on algae near Fernandina Island, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America
Adult green sea turtle (Chelonia mydas), feeding on algae near Fernandina Island, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America
Adult green sea turtle (Chelonia mydas), feeding on algae near Fernandina Island, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America
Adult male Galapagos marine iguana (Amblyrhynchus cristatus), underwater, Fernandina Island, Galapagos, Ecuador, South America