If the seafloor is all made at the mid-ocean ridge system, and there its topography is rough, how do the abyssal plains get so very flat?

Name: If the seafloor is all made at the mid-ocean ridge system, and there its topography is rough, how do the abyssal plains get so very flat?
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The Answer of If the seafloor is all made at the mid-ocean ridge system, and there its topography is rough, how do the abyssal plains get so very flat?

If the Seafloor Is All Made at the Mid-Ocean Ridge