Fragments of volcanic rock and ash that build up to form cinder cones are known as

What Are Fragments of Volcanic Rock and Ash Known As?

A. Melting rocks.

B. Rising magma.

C. Pyroclastic flows.

D. Pyroclastic deposits.

Pretty sure the answer to this question is D, pyroclastic deposits. Because deposits in science are normally fragments of rocks. Don't take my word fully for it though, might be wrong. The answer is D- pyroclastic deposits. Explanation: lol I know this is back from 2017 and it's 2019. I just took a quiz on this and I chose C when the actual answer was D :))))
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