Tuff and Volcanic Breccia Are Both Composed of a Variety

question 39

Multiple Choice

Tuff and volcanic breccia are both composed of a variety of igneous fragments. Their classification as either felsic, intermediate, or mafic therefore depends on the particular:

• A) mineral content of each individual unit.
• B) average grain size of each individual unit.
• C) thickness of each individual unit.

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