It does. Ground penetrating radar (GPR0 is an available and useful apparatus.
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The surface quality is called texture.
they are applyed to a wet surface then yh
It operates across any surface (land or water) on the principle proposed by British Engineer Christopher Cockerell in 1950. The hovercraft is propelled by an air-screw and rides on a cushion of air. This cushion is trapped between the hovercraft's hull and the surface of the water or land below it by a flexible skirt usually made of heavy duty neoprene. The flexible skirt also enables the hovercraft to surmount any obstacles encountered on its voyages.
yes it is it is hard to explain though
Rub the surface down with emery cloth and water. This should give you a smooth surface to work on.