When an ash flow comes to a stop, most of the gas escapes into the atmosphere, leaving behind a chaotic mixture of volcanic ash and rock fragments called __________.

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When an ash flow comes to a stop, it leaves behind a chaotic mixture of volcanic ash and rock fragments called tuff. Ash flow tuff is a type of volcanic tuff that is especially abundant in pyroclastic and ash-flow deposits.

When an Ash Flow Comes to a Stop, Most of the Gas