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Sea Floor Spreading Mid Ocean Ridge • The undersea mountain chain where new oceanic crust is produced Mid-Ocean Ridge (photos) More Evidence for SFS 1. Age of rocks • Young rocks = close to ridge • Old rocks = far from ridge 2. Magnetic Stripes • Iron fragments are reversed in a striped pattern parallel with the ridge Subduction • The process of oceanic crust sinking beneath another piece of crust and melting into the mantle Putting it all together . . .