The average composition of rocks comprising a large composite cone or stratovolcano is generally_______ .

Question

Quizplus · Accepted Answer

The rocks comprising composite cones or stratovolcanoes are generally andesitic in composition, which means they have a mix of minerals including feldspar and mica. This is due to the fact that these volcanoes erupt violently, and their magma is generally rich in volatile gases like water and carbon dioxide. As a result, it is more viscous than basaltic magma, which leads to explosive eruptions and the formation of andesitic rocks.

The Average Composition of Rocks Comprising a Large Composite Cone