Question

What factor determines the composition of magma?

A.amount of fractional crystallization and the composition of the parent rock


B. plate tectonic setting of the volcano

C. composition of the parent rock and the amount of partial melting it underwent

Answer 1

Answer: option C is the correct one.

Step-by-step explanation:

The higher the amount of silica, the higher its is viscosity, which is what constitutes the magma.