Characteristics of the Seafloor Answers

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1
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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.
2
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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
3

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.

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