A majority of the planet 's solid surface is abyssal plain , at depths between NUMBER@1 and NUMBER@2 m -LRB- NUMBER@3 to NUMBER@4 ft -RRB- below the surface of the oceans .

Most of the sea-bed is between NUMBER@1 and NUMBER@2 m -LRB- NUMBER@3 to NUMBER@4 ft -RRB- below the surface of the ocean .
