Ngauruhoe (7515ft or 2291m) is a beautifully shaped volcano on the edge of the Tongariro massif. Ngauruhoe is New Zealand's most active volcano with 61 eruptions since 1839.

Walkers looking at fresh lava flow (black) having come from lava cones at the summit of Ol Donyo Lengai, East Africa's only active volcano, Tanzania.

Hikers enjoy the view on the verdant slopes of the active Tungurahua Volcano that threatens the nearby town of Banos, Ambato Province, Central Highlands, Ecuador, South America

Lava beds surround Snaefellsjokull, an active strato volcano capped in snow and ice, on the Snaefellsnes Peninsula, North West area, Iceland, Polar Regions

Moss covered lava beds surround Snaefellsjokull, an active strato volcano capped in snow and ice, on the Snaefellsnes Peninsula, North West area, Iceland, Polar Regions

The Pulu O's cinder cone, the active vent on the southern flank of the Kilauea volcano, UNESCO World Heritage Site, Big Island, Hawaiian Islands, United States of America, North America

The verdant slopes of the active Tungurahua Volcano that threatens the nearby town of Banos, Ambato Province, Central Highlands, Ecuador, South America

Tourists on rim of volcano, active in 1970, one of two in Antarctica, with cruise ship in the background, on Deception Island, Antarctic Peninsula, Antarctica, Polar Regions

The Pu'u O'o cinder cone, the active vent on the southern flank of the Kilauea volcano, Big Island, Hawaii, Hawaiian Islands, United States of America, North America

Looking across the old crater towards the smoking 2438m summit of the active volcano Mount Canison, Visayan island of Negros, Philippines, Southeast Asia, Asia

Smoke rises from the active crater of Tungurahua Volcano that threatens the nearby resort town of Banos, Ambato Province, Central Highlands, Ecuador, South America

Hikers on Dome Ridge near the summit of 2797m Mount Ruapehu, highest and most active of the volcanoes in the National Park, Tongariro National Park, UNESCO World Heritage Site, central plateau, North Island, New Zealand, Pacific

Tourists on rim of volcano, active in 1970, one of two in Antarctica, with cruise ship in the background, on Deception Island, Antarctic Peninsula, Antarctica, Polar Regions

France, Reunion island (French overseas department), Piton de la Fournaise, an active volcano, surrounding by clouds (aerial view)

Aerial view of basalt lava field with collapsed roof window into an active flowing lava tube on the south flank of Kilauea volcano in Puna, Big Island, Hawaii, Hawaiian Islands, United States of America, Pacific, North America

The Pulu O's cinder cone, the active vent on the southern flank of the Kilauea volcano, UNESCO World Heritage Site, Big Island, Hawaiian Islands, United States of America, North America

Smoke rises from the active crater of Tungurahua Volcano that threatens the nearby town of Banos, Ambato Province, Central Highlands, Ecuador, South America

France, Reunion island (French overseas department), Piton de la Fournaise, the Dolomieu crater is still an active volcano (900m in diameter, the biggest crater of the volcano)