5. The Pacific Ocean basin is the largest most expansive of the ocean basins, Why then is there no ocean ridges observed in the north and central Pacific Basin (where did it go)?

Can someone please help me?

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Your answer is d. silli hope this ! : ) i left an explanation down below if you need it: a sill forms when hot magma squeezes between layers of rock to form a hardened sheet of rock. a sill is basically a tabular sheet intrusion between old layers of sedimentary rock, volcanic beds, or in the direction of foliation inherent in metamorphic rock. the word sill means a concordant intrusive sheet.

Your answer would be 625,000,000.