The concept of seafloor spreading was supported by magnetic polarity stripes on the ocean floor.

Question

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Magnetic polarity stripes on the ocean floor provided evidence for seafloor spreading. As magma rises at mid-ocean ridges, the iron particles in the magma align with Earth's magnetic field, creating a record of magnetic reversals in the rock. This record of magnetic stripes shows that the seafloor is spreading, with new rock forming at mid-ocean ridges and older rock moving away from the ridges.

The Concept of Seafloor Spreading Was Supported by Magnetic Polarity