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Magnetic Bands On The Ocean Floor. The patterns reflect the creation and spreading of oceanic crust along the mid-oceanic ridges. New oceanic crust is magnetized as it forms and then it moves away from the ridge in both directions.
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New oceanic crust is magnetized as it forms and then it moves away from the ridge in both directions. Mid-ocean ridges and subduction zones are plate boundaries. Plate tectonics and reversals of the Earths magnetic field are responsible for the magnetic stripes found on the ocean floor.
TF Alternating magnetic bands on the ocean floor are evidence that Earths magnetic field changes.
Seafloor rocks contain magnetite. These patterns of stripes provide the history of seafloor spreading. The striped magnetic pattern develops because as oceanic crust pulls apart magma rises to the surface at mid-ocean ridges and spills out to create new bands of ocean floor. At the mid-ocean ridge spreading axis these flips in the direction of the Earths magnetic field are recorded in the magnetization of the lava.
