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| Question | Answer |
| Name and describe the feature of the ocean floor shown at A | mid ocean ridge |
| Name the process occurring at B, and explain what results from it | sea floor spreading |
| What happens to old oceanic crust as new material rises from the mantle | old material pushes away |
| Name evidence for sea floor spreading | tube worms, old rock, magnetic stripes, pillow rocks |
| What process is shown occurring at C, and why does it occur | subduction at deep-ocean trench |
| Who hypothesis about sea floor spreading | Harry Hess |
| What are the names of the geologist that made maps | Heezen and Tharp |
| A canyon on the ocean floor at which the crust bends downward is called | deep ocean trench |
| The process that continually adds new material to the ocean floor is called | sea floor spreading |
| The process by which the ocean floor sinks into the mantle is known as | subduction |
| A chain of underwater mountains along which sea-floor spreading occurs is | mid ocean ridge |