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

Foz de Iguazu (Iguacu Falls), the largest waterfalls in the world, Iguacu National Park, UNESCO World Heritage Site, Brazil, South America

Second Beach, Olympic National Park, UNESCO World Heritage Site, Washington, United States of America, North America

Waterfall in Whitfield Gill near Askrigg, Wensleydale, North Yorkshire, Yorkshire, England, United Kingdom, Europe

Murchison Falls (Kabarega Falls) on the Nile, Murchison Falls National Park, Uganda, East Africa, Africa

Tourists watching the stunning Murchison Falls (Kabarega Falls), Murchison Falls National Park, Uganda, East Africa, Africa

Victoria Falls, UNESCO World Heritage Site, Zambesi River, on the border of Zambia and Zimbabwe, Africa

Tropical paradise of Seventy Five Mile Beach, Fraser Island, UNESCO World Heritage Site, Queensland, Australia, Pacific

Woman looks at the stunning Murchison Falls (Kabarega Falls), Murchison Falls National Park, Uganda, East Africa, Africa

Murchison Falls (Kabarega Falls) on the Nile, Murchison Falls National Park, Uganda, East Africa, Africa

Water turning to steam by subterranean heat, Islote de Hilario, Timanfaya National Park, Lanzarote, Canary Islands, Spain

Maid of the Mist tour excursion boat under the Horseshoe Falls waterfall with rainbow at Niagara Falls, Ontario, Canada, North America

Spokane River in Major Flood, Riverfront Park, Spokane, Washington State, United States of America, North America

Foz de Iguazu (Iguacu Falls), the largest waterfalls in the world, Iguacu National Park, UNESCO World Heritage Site, Brazil, South America

Riverside Geyser, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Falls on Nigel Creek, Banff National Park, UNESCO World Heritage Site, Alberta, Canada, North America

Model of Beebe windmill, Sag Harbor, The Hamptons, Long Island, New York State, United States of America, North America

Murchison Falls (Kabarega Falls) on the Nile, Murchison Falls National Park, Uganda, East Africa, Africa

Spokane River in major flood, Riverfront Park, Spokane, Washington State, United States of America, North America

Waterfall in Whitfield Gill near Askrigg, Wensleydale, North Yorkshire, Yorkshire, England, United Kingdom, Europe

Fisherman getting hit by a wave while rock fishing at Snapper Rocks, Tweed Heads, Gold Coast, Queensland, Australia, Pacific

Foz de Iguazu (Iguacu Falls), the largest waterfalls in the world, Iguacu National Park, UNESCO World Heritage Site, Brazil, South America

Foz de Iguazu (Iguacu Falls), the largest waterfalls in the world, Iguacu National Park, UNESCO World Heritage Site, Brazil, South America

Foz de Iguazu (Iguacu Falls), the largest waterfalls in the world, Iguacu National Park, UNESCO World Heritage Site, Brazil, South America

Bright blue sky and waves breaking at Surfers Paradise Beach, Gold Coast, Queensland, Australia, Pacific

Dinorwic (Dinorwig) Power Station and Dinorwic Quarry across Llyn Peris, Eryri, Snowdonia National Park, North Wales, United Kingdom, Europe

The world's first Ironbridge built by Abraham Darby over the River Severn at Ironbridge Gorge, UNESCO World Heritage Site, Shropshire, England, United Kingdom, Europe

Hoover Dam on the Colorado River forming the border between Arizona and Nevada, United States of America, North America

Woman looks at the stunning Murchison Falls (Kabarega Falls), Murchison Falls National Park, Uganda, East Africa, Africa

Murchison Falls (Kabarega Falls) on the Nile, Murchison Falls National Park, Uganda, East Africa, Africa

Two tourists in yellow raincoats in the spray of the Horseshoe Falls waterfall whilst on the Journey under the Falls tour at Niagara Falls, Ontario, Canada, North America

Dinorwic (Dinorwig) Power Station and Dinorwic Quarry across Llyn Peris, Eryri, Snowdonia National Park, North Wales, United Kingdom, Europe

American Falls at Niagara Falls, Niagara Falls, New York State, United States of America, North America

Old Faithful Geyser erupting, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Athabasca Falls, Jasper National Park, UNESCO World Heritage Site, British Columbia, Rocky Mountains, Canada, North America

Hoover Dam on the Colorado River forming the border between Arizona and Nevada, United States of America, North America

Old Faithful Geyser erupting in summer evening light, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Hoover Dam on the Colorado River forming the border between Arizona and Nevada, United States of America, North America

View of Lower Falls from Red Rock Point, Grand Canyon of the Yellowstone River, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Old Faithful Geyser erupting in summer evening light, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Murchison Falls (Kabarega Falls) on the Nile, Murchison Falls National Park, Uganda, East Africa, Africa

Riverside Geyser, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Tourist boat at Iguazu Falls, Iguazu National Park, UNESCO World Heritage Site, Misiones, Argentina, South America

Riverside Geyser, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Kicking Horse River and Takakkaw Falls, Yoho National Park, UNESCO World Heritage Site, British Columbia, Rocky Mountains, Canada, North America

Kicking Horse River and Takakkaw Falls, Yoho National Park, UNESCO World Heritage Site, British Columbia, Rocky Mountains, Canada, North America

Tourists at Bossetti Falls, Iguazu Falls, Iguazu National Park, UNESCO World Heritage Site, Misiones, Argentina, South America

Takakkaw Falls, Yoho National Park, UNESCO World Heritage Site, British Columbia, Rocky Mountains, Canada, 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