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Mud being ejected from the caldera floor of an active andesite stratovolcano on White Island, North Island, New Zealand, Pacific

Boiling mud at an active andesite stratovolcano on White Island, off the east side of North Island, New Zealand, Pacific

An active andesite stratovolcano on White Island, off the east side of North Island, New Zealand, Pacific

Visitors to an active andesite stratovolcano on White Island, off the East side of North Island, New Zealand, Pacific

Man fire spinning (Fire Poi) on Cornish clifftops, Godrevy, Cornwall, England, United Kingdom, Europe

Foz de Iguazu (Iguacu Falls), Iguazu National Park, UNESCO World Heritage Site, Argentina, South America

A cleaner shrimp (Lysmata amboinensis), inspects the teeth of an undulated moray eel, Hawaii, United States of America, Pacific, North America

A great barracuda (Sphyraena barracuda) comes close to the reef to be cleaned by a cleaner wrasse, Hawaii, United States of America, Pacific, North America

Close-up of a devil scorpionfish (Scorpaenopsis diabolus), Hawaii, United States of America, Pacific, North America

The spotted porcupinefish (Diodon hystrix), Hawaii, United States of America, Pacific, North America

Great white shark (Carcharodon carcharias), Seal Island, False Bay, Simonstown, Western Cape, South Africa, Africa

Great white shark (Carcharodon carcharias), Seal Island, False Bay, Simonstown, Western Cape, South Africa, Africa

A climber makes his way across a crevasse using a temporary ladder, Khumbu region, Himalayas, Nepal, Asia

Climbers crossing crevasse and ladder on Mount Everest, Solu Khumbu Everest Region, Sagarmatha National Park, UNESCO World Heritage Site, Nepal, Himalayas, Asia

Crossing ladders on the Khumbu icefall on Mount Everest, Solu Khumbu Everest Region, Sagarmatha National Park, UNESCO World Heritage Site, Nepal, Himalayas, Asia

Crossing ladders on the Khumbu icefall on Mount Everest, Solu Khumbu Everest Region, Sagarmatha National Park, UNESCO World Heritage Site, Nepal, Himalayas, Asia

A great white shark (Carcharodon carcharias), breaks the surface off Guadalupe Island, Mexico, North America

Grey reef sharks (Carcharhinus amblyrhynchos), at a controlled feeding of the island of Yap, Micronesia, Pacific

A Galapagos shark (Carcharhinus galapagensis), breaching the surface, Hawaii, United States of America, Pacific, North America

A nurse shark (Ginglymostoma cirratum) pictured with a school of juvenile jacks. Bahamas, Central America

A climber makes her way down an ice wall in preparation for climbing Everest, Himalayas, Nepal, Asia

A close-up of the underside of the crown-of-thorns starfish (Acanthaster planci), United States of America, North America

The very capable teeth in the jaw of a stout moray (Gymnothorax eurostus), Hawaii, United States of America, Pacific, North America

Scavenging sea stars and a humpback shrimp (Pandalus hypsinotus) working on the remains of a rock crab, Canada, North America

Farm buildings and green fields with the ash plume of the Eyjafjallajokull eruption in the distance, near Hella, southern area, Iceland, Polar Regions

Landscape covered in volcanic ash and dust with the ash plume of the Eyjafjallajokull eruption in the distance, southern area, Iceland, Polar Regions

Man on a rock, Kjeragbolten, Kerag chockstone boulder, Lyseboten, Lysefjord, Norway, Scandinavia, Europe

Amanita muscaria (fly agaric) (fly amanita) a poisonous fungus, Dolomite, Belluno province, Italy, Europe

A close-up of the mouth of a whitemouth moray eel (Gymnothorax meleagris), showing its needle sharp teeth, United States of America, North America

Seventh Encierro (running of the bulls), San Fermin festival, Pamplona, Navarra (Navarre), Spain, Europe

Seventh Encierro (running of the bulls), San Fermin festival, Pamplona, Navarra (Navarre), Spain, Europe

Festival de Recortadores (Trimmers Festival), San Fermin fetival, Pamplona, Navarra (Navarre), Spain, Europe

Eighth and last Encierro (running of the bulls), San Fermin festival, Pamplona, Navarra (Navarre), Spain, Europe

Eighth and last Encierro (running of the bulls), San Fermin festival, Pamplona, Navarra (Navarre), Spain, Europe

Overhead view of morning commute traffic on a busy Chinese city street with pedestrians and blurred vehicles, Chengdu, Sichuan, China, Asia

Desert elephant (Loxodonta africana), Huab River Valley, Torra Conservancy, Damaraland, Namibia, Africa

Sidewinder snake (Peringuey's adder) (Bitis peringueyi), Skeleton Coast National Park, Namibia, Africa

Panorama of sulphur worker appearing out of toxic fumes at Kawah Ijen volcano, East Java, Indonesia, Southeast Asia, Asia

Koala Bear (Phascolarctos cinereus) at Port Macquarie Koala Bear Hospital, New South Wales, Australia, Pacific

Mount Bromo volcano erupting at sunrise, sending volcanic ash high into the sky, East Java, Indonesia, Southeast Asia, Asia

RAF helicopter performing a coastal rescue at the base of the steep cliffs of Spekes Mill Mouth, Hartland, Devon, England, United Kingdom, Europe

A woman smiles for the camera as she is bounced back up during a Bungee jump at The Last Resort, Nepal, Asia

A man smiles for the camera as he is bounced back up during a Bungee jump at The Last Resort, Nepal, Asia

A climber on Everest makes his way across a crevasse using a temporary ladder, Khumbu Region, Nepal, Asia

A climber on Everest makes her way across a crevasse using a temporary ladder, Khumbu Region, Himalayas, Nepal, Asia

Climbers approaching the Tunnel to the Aiguile du Midi, 3842m, Graian Alps, Chamonix, Haute Savoie, French Alps, France, Europe

Climber on the Yellow Tower of Ama Dablam, Sagarmatha National Park, UNESCO World Heritage Site, Khumbu Valley, Nepal, Asia

Multiple strikes of forked and intracloud lightning coming from the sky during a summer thunderstorm, Cheshire, England, United Kingdom, Europe

Environmental information poster about ecosystem of limestone cenotes, Yucatan, Mexico, North America

Sign protected area (Zone de Reserva), Cies Islands, Atlantic Islands Galicia Maritime Terrestrial National Park, Galicia, Spain, Europe

Red wooden boat crossing the ice in front of the Eqi Glacier, near Ilulissat, Greenland, Polar Regions

Snowboarder heads down, Paradise area, Mount Rainier, Washington State, United States of America (U.S.A.), North America