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.

Question

Quizplus · Accepted Answer

The classification of tuff and volcanic breccia as felsic, intermediate, or mafic depends on the mineral content of the fragments within each rock, as this determines the overall composition and classification of the rock.

Tuff and Volcanic Breccia Are Both Composed of a Variety