The composition of the upper mantle is defined by ________.

Question

Quizplus · Accepted Answer

The upper mantle is composed mostly of peridotite, which is a dense, coarse-grained igneous rock rich in iron and magnesium. This has been determined through analysis of seismic waves and studies of mantle-derived rocks that have made their way to the surface through volcanic activity. Granite and quartz are typically found in the continental crust, and perovskite is a mineral found deeper in the mantle.

The Composition of the Upper Mantle Is Defined by ________