Which of the following is NOT a factor that affects the viscosity of magma?

A) pressure
B) temperature
C) composition
D) crystal content
E) depth

Viscosity

A measure of a fluid's resistance to flow, where fluids with high viscosity flow more slowly than those with low viscosity.

Crystal Content

The proportion of crystals within a rock, influencing its texture and appearance, particularly relevant in the study of igneous rocks.

Composition

In geology, refers to the mineral makeup of a rock or sediment, indicating its chemical and physical properties.