Chapter 12 Test

Bio 145

The P-wave shadow is the result of:

Refraction of P waves at the mantle-core boundary

Which statement is true of the Earth’s magnetic field?

Force lines intersect the Earth’s surface at steep angles at high latitudes

The Earth’s mantle has a similar composition to:

Stony meteorites

Earth’s magnetic is formed by:

Liquid movement in the outer core

The lithosphere contains which layer?

Crust

Which is a very, dense, solid, iron-rich alloy?

Inner Core

Earth’s magnetic field originates in the:

Outer core

The asthenosphere is contained in the:

Mantle

The Mohorovicic discontinuity is at the top of the:

Mantle

Contains a large percentage of feldspars and quartz:

Crust

The diameter of the Earth’s core was discovered by:

Analysis of P-wave and S-wave shadows

Evidence for a solid inner core:

B. P waves are faster in the inner core than outer core

The inner core consist of:

Crystalline iron and nickel

Name of the seismic discontinuity at the crust-mantle boundary:

Moho

Which layer of the earth has the smallest volume?

Crust

Which layer of the earth is enriched in silicon, potassium, sodium, and aluminum?

Crust

Which has the closest composition to that of the mantle?

Peridotite 

If a shallow earthquake occurred directly under the South Pole, a North Pole seismic station: 

Receive P waves but not S waves 

The 660-kilometer discontinuity is caused by:

The transition from spinel to perovskite mineral structure in the mantle

The asthenosphere is:

Soften peridotite