The average composition of rocks comprising a large composite cone or stratovolcano is similar to a (an) ________ magma.

Question

Question: The average composition of rocks comprising a large composite cone or stratovolcano is similar to a (an) ________ magma.

Options:

1.  basaltic
2.  ultramafic
3.  andesitic
4.  rhyolitic

Answer 1

3. Andesitic

The average composition of rocks comprising a large composite cone or stratovolcano is similar to an andesitic magma.

Andesite is a volcanic rock of intermediate composition. It is a gray to black volcanic rock with between about 52 and 63 weight percent silica (SiO2).