Exploding lava bubble. A loud detonation and a strong shock wave, that felt like a punch into the stomach when observed from 300 meters distance, accompanies these bursts. Even in 10 km distance, windows rattle. (Photo: Tom Pfeiffer)
Blue flames of burning sulfur: Ijen volcano in East Java has one of the most impressive sulfur deposits on earth. They are so hot that the sulfur often ignites - a mysterious display at night caught on camera.
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