Sulfuric acid hot springs, Dallol, Danakil Depression, Afar Region, Ethiopia, Africa

Puente del Inca, rock arch and old thermal bath of the sulphur spring above the Rio de las Cuevas, near Uspallata, Mendoza Province, Argentina, South America

Sulphure formations, Dallol, Danakil Depression, Ethiopia, Africa

Emerald Lakes, crater lakes, volcanic landscape, Tongariro Alpine Crossing, Tongariro National Park, North Island, New Zealand, Oceania

Puente del Inca, old thermal bath of the sulphur spring, near Uspallata, Mendoza Province, Argentina, South America

Geothermal area with sulphur deposits and acidic brines, Dallol, Danakil depression, Ethiopia, Africa

Hidden bay on the Mediterranean at sunrise. Look at the small beach of sand and pebbles, the beach is bathed in warm colours of the dawn in the morning. View of the sea at Xigia Sulfur Beaches, Zakynthos, Ionian Islands, Greece, Europe

Sulphure formations, Dallol, Danakil Depression, Ethiopia, Africa

Geothermal area with sulphur deposits and acidic brines, Dallol, Danakil depression, Ethiopia, Africa

Krafla volcanic area, sulfur springs, Leirhnjúkur, Reykjahlíð, Mývatni, Island

Crater lake of Kawah Ijen, Kawah Ijen, Jawa Timur, Java, Indonesia, Asia

Krafla volcanic area, sulfur springs, Leirhnjúkur, Reykjahlíð, Mývatni, Island

Boardwalk through the solfatara field Bumpass Hell, Lassen Volcanic National Park, California, USA, North America

Two tourists standing beside steaming fumarole, solfatara in Hverarond, also Hverir or Namaskard, geothermal area, North Iceland, Iceland, Europe

The basin of hot sulphur spring in Bagno Vignoni and Hotel Le Terme at night, Orcia Valley, Tuscany, Italy, Europe

Sulphure formations, Dallol, Danakil Depression, Ethiopia, Africa

Sulphuric vapours from a crack in the earth, Vulcano, Aeolian Islands, Italy, Europe

Aerial view, volcanic crater with colourful sulphur deposits, near Frioland ao Fjallabaki, Iceland, Europe

Sulphure formations, Dallol, Danakil Depression, Ethiopia, Africa

Hot volcanic springs, thermal bath, Saturnia, Tuscany, Italy, Europe

Sulfur vapor, petrified trees in New Blue Spring Road, limestone sinter terraces, steaming geysers, hot springs, Mammoth Hot Springs Terraces in Yellowstone National Park, Wyoming, United States of America

Sulfur spring, Salar de Uyuni salt lake, Uyuni, Bolivia, South America

Sulfur spring, Salar de Uyuni salt lake, Uyuni, Bolivia, South America

A village named Muftaffabad Loni on the outskirts of New Delhi, India that specializes in recycling circuit boards from electronics. The boards are taken out of electronics in other areas of New Delhi. Some of the boards are burned, some are dipped in sulfuric acid to get the metals separated from the plastics.