If Earth's Oceans Were as Deep as Europa's

Earth's deepest point, the Challenger Deep, is almost seven miles below sea level. By contrast, Europa is smaller than even Earth's moon, yet its oceans are anywhere between 40-100 miles deep! So the basic question is--would it be tectonically feasible for Earth's oceans to be as deep as Europa's? Meaning, would it still have active plate tectonics and above-sea-level landmasses?

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If Earth's Oceans Were as Deep as Europa's

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