GEOLOGY

Detailed explanation-1: -These surveys revealed a series of invisible magnetic “stripes” of normal and reversed polarity in the sea floor, like that shown in the figure below. The patterns reflect the creation and spreading of oceanic crust along the mid-oceanic ridges. Basalt forming at the ridge crest picks up the existing magnetic polarity.

Detailed explanation-2: -At the mid-ocean ridge spreading axis, these flips in the direction of the Earth’s magnetic field are recorded in the magnetization of the lava. This creates a symmetrical pattern of magnetic stripes of opposite polarity on either side of mid-ocean ridges.

Detailed explanation-3: -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.

Detailed explanation-4: -Magnetic striping is a pattern of magnetic fields in strips of rock as they radiate outward from an ocean ridge. What happens here is that, near the ocean ridge itself, we have younger rock that was more recently formed from magma that is emitted through cracks in the Earth’s crust.