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Mid-Ocean Ridges 1. In what year did scientists discover mid-ocean ridges? 213 ________________________________ 2. Summarize how scientists were able to map out the ocean floor. 213 ________________________________________________________ ________________________________________________________ ________________________________________________________ ________________________________________________________ ________________________________________________________ 3. What process was discovered the 1960s that helped explain how the continents drifted? 214 _________________________________________________ 4. What does seafloor spreading mean? 214 ________________________________________________________ ________________________________________________________ ________________________________________________________ ________________________________________________________ 5. Why does magma rise up through the cracks in the crust at a mid-ocean ridge? 214 ________________________________________________________ ________________________________________________________ ________________________________________________________ 6. As the seafloor continues to spread apart what happens to the older oceanic crust? 214 ________________________________________________________ _______________________________________________________ 7. Why is the seafloor smooth farther away from the ridge? 215 ________________________________________________________ ________________________________________________________ ________________________________________________________ 8. Summarize why the continents move. 215 ________________________________________________________ ________________________________________________________ ________________________________________________________ 9. Is a mid-ocean ridge a convergent, divergent, or a transform boundary? _______________________________________________ 10.