A static cross-section diagram showing the solid layers of the Earth (crust, mantle, core) to prove there is no empty space for water to drain into.
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Look at this cross-section. Beneath the ocean floor lies thick crust, then the mantle, and finally a dense metallic core. Water cannot drain into a void because there is no void. The path downward is blocked by millions of miles of solid, high-pressure rock and metal.
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