The Mid-Ocean Ridges Are Elevated Above the Surrounding Sea Floor

question 37

Multiple Choice

The mid-ocean ridges are elevated above the surrounding sea floor because ____________.

• A)ridge rocks are hot and therefore of relatively low density
• B)the lithospheric plates are thickest at the ridges so they stand up taller
• C)rising ocean currents leave a vacuum above the ridge
• D)ridge rocks are mafic,whereas the ocean basin crust consists of ultramafic rock

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