The yellow needle-like sulfur crystals reveal that the temperature in this crack has not gone below 90 degrees C, as the sulfur would have otherwise take a more isometric shape (Photo: Ingrid Smet)
The yellow needle-like sulfur crystals reveal that the temperature in this crack has not gone below 90 degrees C, as the sulfur would have otherwise take a more isometric shape (Photo: Ingrid Smet)
Copyright: Ingrid Smet
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