The average composition of rocks comprising a large composite cone or stratovolcano is similar to a(n)________ magma.
A)basaltic
B)ultramafic
C)andesitic
D)rhyolitic

Question

Quizplus · Accepted Answer

Stratovolcanoes are typically composed of alternating layers of lava and ash, which are often composed of andesitic rocks. Andesitic magma is intermediate in composition between basaltic and rhyolitic, and it is commonly associated with explosive eruptions, which are common features of stratovolcanoes. Therefore, the most likely answer is C)andesitic.

The Average Composition of Rocks Comprising a Large Composite Cone