Fragments ejected from a volcano ranging in size from boulders to fine dust are collectively referred to as:

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Fragments ejected from a volcano are collectively known as tephra, which can range in size from boulders to fine dust. Lava (A) specifically refers to the molten rock that flows out of a volcano, while lahars (B) are mudflows that occur when volcanic ash mixes with water. Ash (C) refers to the smallest size of tephra, typically less than 2mm in diameter. Pumice (E) is a type of volcanic rock characterized by its highly vesicular texture and low density, but it is not a collective term for all volcano fragments.

Fragments Ejected from a Volcano Ranging in Size from Boulders