White Island (Whakaari) active marine volcano in the Bay of Plenty, North Island, New Zealand, Pacific

White Island (Whakaari) active marine volcano in the Bay of Plenty, North Island, New Zealand, Pacific

Diver in volcanic formations, El Hierro, Canary Islands

A thorny seahorse, Hippocampus hystrix, sits on a sponge covered perch, Bima Bay, Sumbawa, Nusa Tenggara, Indonesia, Pacific Ocean

Wonderpus or Wunderpus on the sand, Wunderpus photogenicus, Bima Bay, Sumbawa, Nusa Tenggara, Indonesia, Pacific Ocean

Kamchatka Peninsula, Russia

Harrat Al Birk, Saudi Arabia

Aragonese castle, Ischia island, Naples, Campania, Italy, Europe

A group of divers and a manta ray (Manta alfredi) on one of the corners of the Backwall at Molokini Marine Preserve, Maui, Hawaii, United States of America

The Backwall at Molokini Marine Preserve drops down to 300 feet. Various reef fish stick close to a crevice here, Molokini, Maui, Hawaii, United States of America

Smoke from molten lava at night, Big Island, Hawaii, USA

Smoke from molten lava at night, Big Island, Hawaii, USA

Scubadiver and tectonical rift, Djibouti, Djibuti, Africa, Afar Triangle, Gulf of Aden, Gulf of Tadjourah

Tectonical rift underwater, Djibouti, Djibuti, Africa, Afar Triangle, Gulf of Aden, Gulf of Tadjourah

Tectonical rift underwater, Djibouti, Djibuti, Africa, Afar Triangle, Gulf of Aden, Gulf of Tadjourah

Tectonical rift underwater, Djibouti, Djibuti, Africa, Afar Triangle, Gulf of Aden, Gulf of Tadjourah

Tectonical rift underwater, Djibouti, Djibuti, Africa, Afar Triangle, Gulf of Aden, Gulf of Tadjourah

Tara Oceans Expeditions - May 2011. diving Marine Iguana (Amblyrhynchus cristatus); Isabela Island; Galapagos, Ecuador; The Marine Iguana appears slow and clumsy on land, but this particular species of lizard is the only sea-going lizard in the world. However, it has to return the the land to breed.