A Birkeland current in contact with the Earth might act like a rotating augur, drilling deeply into the bedrock, removing the material, and accelerating it up and away from the point of contact. The effect might be thought of as an electric vacuum, charging the debris in an expanding electric field and then blasting it upward through the power of like-charge repulsion. EDM effects in machine shops strip uniform layers from the substrate while leaving essentially a vertical wall and a flat, new surface. In an interplanetary EDM, the rotating current would tend to lift up sections of strata that would leave a terraced effect and layered appearance, much like what is seen in the Grand Canyon.
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