What term describes a dangerous, fast moving, glowing turbulent cloud of volcanic gases and fine, partially molten, pyroclastic particles, like the 1902 eruption that destroyed St.Pierre on Martinique?

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The Answer of What term describes a dangerous, fast moving, glowing turbulent cloud of volcanic gases and fine, partially molten, pyroclastic particles, like the 1902 eruption that destroyed St.Pierre on Martinique?

What Term Describes a Dangerous, Fast Moving, Glowing Turbulent Cloud