Pyroclastic flow

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Sulfur Fumarole | ​Puʻu ʻŌʻō Crater​ in Hawaii, elemental sulfur vapor escaping from ​the fumarole ​has cooled to form yellow-colored crystals around the margins of the crack. Fumaroles are vents from which volcanic gas escapes into the atmosphere. 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. Photography by U.S. Geological Survey Pyroclastic Flow, Lava Flow, Environmental Art, Volcano, Geology, Travel Photography, Nature Photography, Hawaii, Natural Landmarks

​In this recent photo taken at Puʻu ʻŌʻō Crater​ in Hawaii, we can see ​that ​elemental sulfur vapor escaping from ​the fumarole ​has cooled to form yellow-colored crystals around the margins of the crack. Fumaroles are vents from which volcanic gas escapes into the atmosphere. 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…

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