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Section 1-4 Review and Reinforce: Sea-Floor Spreading - Understanding Main Ideas and Building Vocabulary.

Diagram illustrating sea-floor spreading with labeled features A, B, C, and D, showing the process of oceanic crust formation at a mid-ocean ridge and movement away from it.

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6. The diagram shows features of the ocean floor including a mid-ocean ridge, rift valley, oceanic crust, and trenches.

7. The feature on the ocean floor at C is called a trench.

8. The process that continually adds new material to the ocean floor is seafloor spreading.

9. The process by which the ocean floor sinks into the mantle is called subduction.

10. The chain of mountains that extends into all of Earth’s oceans is the mid-ocean ridge.

Parent Tip: Review the logic above to help your child master the concept of seafloor spreading worksheet.

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