Burning clouds, red flames
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Burning clouds, red flames blow out, abstract illustration

"A pyroclastic flow (also known as a pyroclastic density current or a pyroclastic cloud) is a fast-moving current of hot gas and volcanic matter (collectively known as tephra) that moves away from a volcano about 100 km/h (62 mph) on average but is capable of reaching speeds up to 700 km/h (430 mph). The gases can reach temperatures of about 1,000 °C (1,830 °F)." Wikipedia, The Free Encyclopedia, "Pyroclastic flow", https://en.wikipedia.org/wiki/Pyroclastic_flow
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