Lava always erupts violently when it has an________ composition, as in subduction zones.
A) basaltic
B) ultramafric
C) granitic
D) andesitic

Question

Quizplus · Accepted Answer

Andesitic composition is a mixture of basaltic magma and granitic magma, making it more viscous than basaltic magma alone. This results in more explosive eruptions, especially in subduction zones where the magma interacts with water and other volatiles from the subducting plate.

Lava Always Erupts Violently When It Has An________ Composition, as in Subduction