Question

1.)Asthenosphere is defined by

A)the presence of olivine-based rocks

B)the phase change from spinel to post-spinel structure

C)the presence of partial melting

D)none

Answer 1

Answer:

C)the presence of partial melting

Explanation:

The classification of the asthenosphere a mechanical one. This seeks to understand the forms of the different spheres.

The mechanical model of this entails:

      Lithosphere ---------- Asthenosphere ----------------Outer core ----- inner core

The lithosphere is plastic and rigid but the asthenosphere is made up of weak and ductile earth materials.