Pulverized rock and clastic materials ejected violently during an eruption are called

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Tephra (or pyroclastics) is the general term used for any pulverized rock and clastic materials ejected violently from a volcano during an eruption. This includes material such as ash, fragments of volcanic glass, and other debris. Other choices, such as cinders, explosive debris, volcanic ash, and scoria, are types of tephra/pyroclastics.

Pulverized Rock and Clastic Materials Ejected Violently During an Eruption