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Applying the Concepts
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1

The earth's mantle has a chemical composition that agrees closely with the composition of
A)basalt.
B)iron and nickel.
C)granite.
D)gneiss.
2

From seismological data, the earth's shadow zone indicates that part of the earth's interior must be
A)liquid.
B)solid throughout.
C)plastic.
D)hollow.
3

The Mohorovicic discontinuity is a change in seismic wave velocity that is believed to take place because of
A)structural changes in minerals of the same composition.
B)changes in the composition on both sides of the boundary.
C)a shift in the density of minerals of the same composition.
D)changes in the temperature with depth.
4

The oldest rocks are found in (the)
A)continental crust.
B)oceanic crust.
C)neither, since both are the same age.
5

The least dense rocks are found in (the)
A)continental crust.
B)oceanic crust.
C)neither, since both are the same density.
6

The idea of seafloor spreading along the Mid-Atlantic Ridge was supported by evidence from
A)changes in magnetic patterns and ages of rocks moving away from the ridge.
B)faulting and volcanoes on the continents.
C)the observation that there was no relationship between one continent and another.
D)all of the above.
7

According to the plate tectonics theory, seafloor spreading takes place at a
A)convergent boundary.
B)subduction zone.
C)divergent boundary.
D)transform boundary.
8

The presence of an oceanic trench, a chain of volcanic mountains along the continental edge, and deep-seated earthquakes is characteristic of a (an)
A)ocean-ocean plate convergence.
B)ocean-continent plate convergence.
C)continent-continent plate convergence.
D)None of the above is correct.
9

The presence of an oceanic trench with shallow earthquakes and island arcs with deep-seated earthquakes is characteristic of a (an)
A)ocean-ocean plate convergence.
B)ocean-continent plate convergence.
C)continent-continent plate convergence.
D)None of the above is correct.
10

The ongoing occurrence of earthquakes without seafloor spreading, oceanic trenches, or volcanoes is most characteristic of a
A)convergent boundary between plates.
B)subduction zone.
C)divergent boundary between plates.
D)transform boundary between plates.
11

The evidence that the earth's core is part liquid or acts like a liquid comes from (the)
A)P-wave shadow zone.
B)S-wave shadow zone.
C)meteorites.
D)all of the above.





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