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Oceanography Unit 1 THE SEA FLOOR Unit Summary Questions Name 1. Period The major basins of the world ocean are the , and , , . The ocean around Antarctica is sometimes called the 2. The of a substance is calculated by dividing its mass by its volume. 3. The four main divisions of the earth’s interior are the , the 4. 5. , the , and the crust. A long chain of submarine volcanic mountains that runs through the world ocean is called the system. Sea floor is created at and destroyed at . 6. In the process of 7. A single supercontinent called continents about 8. a lithospheric plate descends into the . began to break up into the present day years ago. The two most abundant types of marine sediment are which comes from rocks, and sediment, sediment, which is produced by organisms. 9. The continental margins consist of the , the continental slope, and the . 10. Most of the deep sea floor, or , is between meters deep. Unit 1 – The Sea Floor 1 and