What is a possible explanation for why the chemical composition of basalts from mid-oceanic ridges is different than those that erupt at hot spots?
A) subduction zone model
B) single-layered mantle model
C) spreading center model
D) two-layered mantle model

Question

Quizplus · Accepted Answer

The two-layered mantle model proposes that there are two distinct layers within the mantle, with different chemical compositions and densities. Basalts from mid-oceanic ridges are thought to originate from the upper layer, while those that erupt at hot spots come from the lower layer. As a result, the chemical composition of these basalts is different due to differences in their mantle source regions.

What Is a Possible Explanation for Why the Chemical Composition