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

question 29

Multiple Choice

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

• A)ridge rocks are hot and therefore have relatively low density
• B)the lithosphere is thickest at the ridges so they stand up taller
• C)rising ocean currents create a vacuum that pulls ridges up
• D)ridge rocks are mafic,which are less dense than ultramafic ocean basin rock

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