Sulphur fumarole at Puu Oo Crater in Hawaii. Sulphur vapour has cooled to form yellow crystals around the vent. Fumaroles may occur along tiny cracks or long fissures, in chaotic clusters or fields, and on the surfaces of lava flows and thick deposits of pyroclastic flows. They may persist for decades or centuries if they are above a persistent heat source or disappear within weeks to months if they occur atop a fresh volcanic deposit that quickly cools. An optimised version of a US Geological Survey image. Credit: USGS

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Size: 5184px × 3456px
Location: USA, Hawaii
Photo credit: © digitaleye / USGS / Alamy / Afripics
License: Licensed
Model Released: No

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