Characteristics of the Seafloor

Question 1

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

Revolt · Accepted Answer

lithosphere colliding

Question 2

Which type of material becomes molten rock at subduction zones?

Revolt · Accepted Answer

heavy plates

Question 3

Why do rocks on the ocean floor form a pattern of magnetized stripes?

Revolt · Accepted Answer

The rocks contain iron that points in different directions depending on Earth's polarity.

Question 4

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

Revolt · Accepted Answer

They reveal a matching pattern on either side of the ridge.

Question 5

How does oceanic crust move along mid-ocean ridges?

Revolt · Accepted Answer

away from the ridge

Question 6

Which information did the Glomar Challenger study in 1968?

Revolt · Accepted Answer

the age of rocks in various places in the ocean

Question 7

Which evidence originally supported Hess’s idea of seafloor spreading in 1968?

Revolt · Accepted Answer

Younger rocks are closer to mid-ocean ridges.

Question 8

Which statement describes the cyclic nature of seafloor spreading?

Revolt · Accepted Answer

New oceanic crust is created.

Question 9

Which statement describes the relationship between seafloor spreading and continental drift?

Revolt · Accepted Answer

As the seafloor spreading occurs, the continents move.

Question 10

Which concept is described in the theory proposed by Hess?

Revolt · Accepted Answer

Mid-ocean ridges are sites of seafloor spreading.

Characteristics of the Seafloor Answers