To help you master concepts from Chapter 2 (Earth's Interior and Geophysical Properties), take this sample examination.

1		Felsic and mafic are terms used by geologists to describe: Need a Hint?
			A)	the mechanical behavior of rocks.
			B)	composition of continental and oceanic crust.
			C)	behavior of earthquake waves.
			D)	none of these
2		The boundary that separates the crust from the mantle is called: Need a Hint?
			A)	the Moho.
			B)	the crust-mantle boundary.
			C)	the lithosphere.
			D)	all of these
3		The inner core is most likely composed of: Need a Hint?
			A)	iron.
			B)	sulfur.
			C)	oxygen.
			D)	silicon.
4		The principle of continents being in buoyant equilibrium is known as: Need a Hint?
			A)	the elastic rebound theory.
			B)	isostasy.
			C)	the principle of buoyant equilibrium.
			D)	none of these
5		A positive gravity anomaly indicates: Need a Hint?
			A)	a reversal of the gravitational field.
			B)	an excess of mass.
			C)	a deficiency in mass.
			D)	none of these
6		Positive gravity anomalies are often associated with: Need a Hint?
			A)	large cavern systems beneath Earth's surface.
			B)	deep ocean trenches.
			C)	ore bodies beneath Earth's surface.
			D)	all of these
7		A positive magnetic anomaly indicates: Need a Hint?
			A)	mafic rock masses.
			B)	a body of magnetic ore.
			C)	an intrusion of gabbro.
			D)	all of the above
8		Which of the following is not an example of isostasy? Need a Hint?
			A)	ocean basins are deeper than continents
			B)	crustal rebound
			C)	deep mountain roots
			D)	all of these
9		The S-wave shadow zone is evidence that: Need a Hint?
			A)	it is very hot near the core.
			B)	the inner core is solid.
			C)	the outer core is composed of iron and nickel oxides.
			D)	the outer core is liquid.
10		The physical evidence that the core is composed mostly of iron is: Need a Hint?
			A)	scientists have sampled the core and determined its composition.
			B)	volcanoes regularly erupt material from the core to the surface.
			C)	the known mass of Earth requires material of high density at the core.
			D)	all of these
11		The velocity of seismic waves varies through Earth because: Need a Hint?
			A)	the composition of rocks varies within the Earth.
			B)	the composition of rocks varies within the Earth.
			C)	density of rocks varies within the Earth.
			D)	all of these
12		Convection is likely occurring (in): Need a Hint?
			A)	throughout the Earth.
			B)	both the mantle and the outer core.
			C)	the outer core.
			D)	the mantle.
13		The interior composition and structure of Earth have been deduced in part from: Need a Hint?
			A)	analyses of the behavior of seismic waves.
			B)	studies of meteorites.
			C)	deep drilling projects.
			D)	all of these
14		Heat inside Earth: Need a Hint?
			A)	decreases with increasing depth.
			B)	is generated by radioactive decay.
			C)	is uniform throughout the interior.
			D)	none of these
15		The geothermal gradient in the crust averages: Need a Hint?
			A)	100 degrees Celsius per kilometer.
			B)	10 degrees Celsius per kilometer.
			C)	1 degree Celsius per kilometer.
			D)	25 degrees Celsius per kilometer.
16		Heat flow to the surface of Earth: Need a Hint?
			A)	is highest in areas of active volcanism.
			B)	varies from place to place.
			C)	is lowest in stable continental interiors.
			D)	all of these
17		The boundary between the crust and mantle: Need a Hint?
			A)	is the source of the S-wave shadow zone.
			B)	coincides with the boundary between the asthenosphere and lithosphere.
			C)	is marked by a change is velocity of seismic waves.
			D)	none of these
18		The largest portion of Earth's volume is: Need a Hint?
			A)	the outer core.
			B)	the inner core.
			C)	the mantle.
			D)	the crust.
19		The composition of the upper mantle is known because: Need a Hint?
			A)	some caves on Earth extend into the mantle.
			B)	samples of mantle rock have been analyzed by scientists.
			C)	meteorites are believed to be similar to the mantle.
			D)	none of these
20		The average thickness of the crust is: Need a Hint?
			A)	1 km.
			B)	100-150 km.
			C)	30-50 km.
			D)	10-12 km.