This photograph shows Ijen volcano on the Indonesian island of Java. The blue glow is caused by sulfuric gases coming into contact with the air. This volcano is also known as a crater lake with the most acidic water in the world.
Sulfur is also mined in this lake, and the sulfur is carried out and transported by hand. Health hazards have also been reported. While not a high wage, it is better than other jobs in the area, and sulfur mining is a source of income for the residents.
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