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Mr. Radeke
Mr. Radeke Chapter 5 Section 4 Earth Science
| Question | Answer |
|---|---|
| Mid-Ocean Ridge | An undersea mountain chain where new ocean floor is produced. |
| Sonar | A device that determines the distance of an object under water by recording the echoes of sound waves. |
| Sea-Floor Spreading | The process by which molten material adds new oceanic crust to the ocean floor. |
| Deep-Ocean Trench | A deep valley along the ocean floor beneath which oceanic crust slowly sinks toward the mantle. |
| Subduction | The process by which oceanic crust sinks beneath a deep-ocean trench and back into the mantle at a convergent plate boundary. |
| What device is used to map the ocean floor? | Sonar. |
| How does new oceanic crust form? | It forms when lava is erupted onto to the sea floor. |
| Why does the rock of the ocean floor have a pattern of magnetic stripes? | As rock cooled, it became magnetized parallel to the magnetic field that existed at that time. Through time, sea-floor spreading caused the striped pattern on both sides of the ridge. |