1. Explain how rocks on the seafloor record magnetic reversals over time.

When lava is extruded at any mid-ocean ridge, the rock it forms becomes magnetized and acquires the magnetic polarity that exists at the time the lava cools.

2. Diagram the process of seafloor spreading.

When two tectonic plates move toward each other and collide.

3. Use the term seafloor spreading to explain how a mid-ocean ridge forms.

The geologic process that results when tectonic plates split apart and move away from each other.

5. Explain why magnetic stripes on the seafloor are parallel to the mid-ocean ridge.

New crust forms along the ridge when old crust splits and magma rises to fill the gap.

6. Describe how scientists can measure the depth to the seafloor.

Ships using technology called sonar, which stands for sound navigation and ranging, can map the topography of the ocean floor.

7. Determine Refer to the image above. Where is the youngest crust? Where is the oldest crust?

At the center in the mid-ocean ridge and near the land.

8. Describe how seafloor spreading helps to explain the continental drift hypothesis.

The creation of new landmass at the locations in mid-ocean ridges where tectonic plates diverge.

10. Infer why magnetic stripes in the pacific ocean are wider than in the atlantic ocean.

The seafloor spreads more rapidly.

11. Explain why the thickness of seafloor sediments increases with increasing distance from the ocean ridge.

The oceanic crust is older farther away from the ridge.

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chapter 7 lesson 2

Question	Answer
1. Explain how rocks on the seafloor record magnetic reversals over time.	When lava is extruded at any mid-ocean ridge, the rock it forms becomes magnetized and acquires the magnetic polarity that exists at the time the lava cools.
2. Diagram the process of seafloor spreading.	When two tectonic plates move toward each other and collide.
3. Use the term seafloor spreading to explain how a mid-ocean ridge forms.	The geologic process that results when tectonic plates split apart and move away from each other.
4. Oceanic crust forms.	A. at mid-ocean ridges.
5. Explain why magnetic stripes on the seafloor are parallel to the mid-ocean ridge.	New crust forms along the ridge when old crust splits and magma rises to fill the gap.
6. Describe how scientists can measure the depth to the seafloor.	Ships using technology called sonar, which stands for sound navigation and ranging, can map the topography of the ocean floor.
7. Determine Refer to the image above. Where is the youngest crust? Where is the oldest crust?	At the center in the mid-ocean ridge and near the land.
8. Describe how seafloor spreading helps to explain the continental drift hypothesis.	The creation of new landmass at the locations in mid-ocean ridges where tectonic plates diverge.
9. Sequence information copy and fill in the graphic organizer below to explain the steps in the formation of a mid-ocean ridge.	Mid-ocean ridge.
10. Infer why magnetic stripes in the pacific ocean are wider than in the atlantic ocean.	The seafloor spreads more rapidly.
11. Explain why the thickness of seafloor sediments increases with increasing distance from the ocean ridge.	The oceanic crust is older farther away from the ridge.

Created by: Darlin Yunior

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