The Test on Inside the Earth consists of 18 questions. Correct answers will be provided after your answers have been submitted.

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1		Seismic waves moving through the earth's crust suggest
			A)	oceanic crust of rocks like basalt; continental crust of rocks like granite.
			B)	continental crust of quartzite.
			C)	oceanic crust of sedimentary rock.
			D)	both oceanic and continental crust of rocks like basalt.
2		The Mohorovicic discontinuity is the seismic boundary between
			A)	crust and mantle.
			B)	asthenosphere and lithosphere
			C)	mantle and core.
			D)	mantle and asthenosphere
3		Which type of seismic wave does not pass through a fluid?
			A)	body wave
			B)	P-wave
			C)	S-wave
			D)	surface wave
4		The asthenosphere is located
			A)	between the crust and the mantle.
			B)	in the mantle.
			C)	between the crust and the lithosphere.
			D)	in the crust.
5		The size and shape of the earth's core can be measured by information from the
			A)	earth's magnetic field.
			B)	S-wave shadow zone.
			C)	P-wave shadow zone.
			D)	nature of meteorites.
6		Part of the earth's core is believed to be liquid as indicated by information from the
			A)	P-wave shadow zone.
			B)	S-wave shadow zone.
			C)	earth's magnetic field.
			D)	nature of meteorites.
7		The earth's crust
			A)	makes up about one-third of the mass of the earth.
			B)	is only found in continents.
			C)	exists below the oceans and make up the continents.
			D)	supports the asthenosphere, which floats in the crust.
8		The earth's magnetic field
			A)	occasionally undergoes magnetic reversal, flipping the poles.
			B)	is and always has been stable and with a constant orientation.
			C)	will cease to exist forever within the next 2,000 years.
			D)	none of the above.
9		The least dense rocks are found in
			A)	continental crust.
			B)	oceanic crust.
			C)	the mantle.
			D)	the core.
10		The asthenosphere is
			A)	the uppermost layer of the mantle.
			B)	a plastic layer in the upper mantle.
			C)	the boundary between the mantel and the core.
			D)	the solid, dense layer below the moho.
11		Which of the following statements about seismic waves is not true?
			A)	In a P-wave the material vibrates back and forth in the same direction as the direction of wave motion.
			B)	Both P-waves and S-waves travel readily through molten rock.
			C)	P-waves move more rapidly than S-waves.
			D)	Seismic waves are reflected at boundaries between layers of rocks with different densities.
12		Which of the following statements about the earth's core is true?
			A)	Once molten, the core has gradually solidified as it cooled.
			B)	P-waves cannot travel through this layer of the earth.
			C)	The core makes up about 1/3 of the earth's volume.
			D)	the core is mostly made of iron.
13		The theory of plate tectonics describes sea-floor spreading as occurring at a
			A)	divergent boundary.
			B)	subduction zone.
			C)	convergent boundary.
			D)	transform boundary.
14		Earthquakes in California that occur along the San Andreas fault are associated with a
			A)	subduction zone.
			B)	transform boundary.
			C)	convergent boundary.
			D)	divergent boundary.
15		Volcanic mountains on the land and along a coast usually means a
			A)	ocean-ocean plate convergence.
			B)	continent-continent plate convergence.
			C)	ocean-continent plate convergence.
			D)	none of the above.
16		New crustal material is produced where according to the theory of plate tectonics?
			A)	divergent plate boundaries
			B)	subduction zones
			C)	ocean-continent plate convergence
			D)	ocean-ocean plate convergence
17		The average rate of sea-floor spreading that occurs along the Mid-Atlantic ridge is about
			A)	5 cm/yr
			B)	23 m/yr
			C)	0.0003 cm/yr
			D)	234 m/yr
18		When the lithosphere of one place is subducted beneath a second plate, the subducted material does not become
			A)	new mantle material.
			B)	lava that is erupted from volcanoes.
			C)	a body of granite below the surface.
			D)	part of the outer molten core