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Characteristics of the Seafloor Answers

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1
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Which event causes the formation of trenches in Earth’s crust?

A
magma rising
B
mantle emerging
C
volcanoes erupting
D
lithosphere colliding
2
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Which statement describes the relationship between seafloor spreading and continental drift?

A
As the seafloor spreading occurs, the continents do not move.
B
As the continents move, they pull the seafloor with them.
C
As the continents move, they create new seafloor at the coast.
D
As the seafloor spreading occurs, the continents move.
3

How do magnetic stripes of iron in ocean rock provide evidence of seafloor spreading?

A
They show when Earth's poles reversed.
B
They show how the density of the seafloor has changed.
C
They reveal a matching pattern on either side of the ridge.
D
They reveal differences in the mineral composition of newly created rock.
4

Which concept is described in the theory proposed by Hess?

A
Continents do not move.
B
Cool rock pushes through the crust.
C
Trenches are sites of seafloor spreading.
D
Mid-ocean ridges are sites of seafloor spreading.
5

How does oceanic crust move along mid-ocean ridges?

A
away from dense crust
B
parallel to the ridge
C
away from the ridge
D
under less dense crust
6

According to the theory proposed by Harry Hess, what causes continents to move?

A
continental drift
B
magnetic polarity
C
seafloor spreading
D
deep-ocean trenches
7

At the end of seafloor spreading, where does the molten rock solidify?

A
center of the ridge
B
on the edge of the ridge
C
under the new rock
D
between the old rock layers
8

When scientists analyzed drilling samples from the Glomar Challenger study, which discovery did they make about rocks in relation to a mid-ocean ridge?

A
Rocks closer to the ridge are newer.
B
Rocks closer to the ridge contain more iron.
C
Rocks farther from the ridge are denser.
D
Rocks farther from the ridge are more jagged.
9

Which statement describes the cyclic nature of seafloor spreading?

A
Continents are created.
B
New oceanic crust is created.
C
Volcanoes erupt and remove crust.
D
Old crust gets thicker at subduction zones.
10

Which material rises from cracks in oceanic crust?

A
dense crust
B
molten rock
C
continental crust
D
pillow-shaped rocks

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