1. (10 pts) List and Describe the primary compositional layers that comprise the

Question

1. (10 pts) List and Describe the primary compositional layers that comprise the earth's interior? [Hint: the core is compositionally one layer but mechanically two.]

2. (10 pts) List and Describe the primary mechanical layers that comprise the earth's interior?

3. (10 pts) The boundary between the crust and mantle (‘Moho’) was discovered and defined from the way that seismic waves refracted at the crust mantle boundary due to significant seismic velocity differences (i.e., 6.5 km/s vs 8.1 km/s) for the lower crust and upper mantle. Who discovered/defined the Moho? How does the Moho differ from the mechanical boundary between the lithosphere and asthenosphere?

Explanation / Answer

1) the cust and mantle are the two layers which are compositionally different.

the average composition of cust is granodioritic to dioritic or tonalitic. where as the mantle is essentially made up of ultramafic rocks like peridotite and perrovskite

2) lithosphere , asthenoshere, mesosphere( upper and lower mantle), outercore and inner core

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