| 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 |
