Sea Floor Spreading Magnetic Reversal Exercise

Imagnetic reversals exercise 3 2 seafloor spreading rates north america point a pa re o ھے وف س سیم africa ye point b figure 5.

Sea floor spreading magnetic reversal exercise. 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. Seafloor spreading and polar reversal. Basalt forming at the ridge crest picks up the existing magnetic polarity. The discovery of magnetic stripes in oceanic crust and how this supports wegener s theory of continental drift or as we now know it plate tectonics.

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. What they discovered was the mid ocean ridge was actually a site where tectonic plates which are large pieces of the earth s crust were pulling apart from. Enjoy the videos and music you love upload original content and share it all with friends family and the world on youtube.

The motion of the earth s molten outer core produces a magnetic field that is characterized by force lines emanating from near the. A polarity reversal means that the magnetic north flips to where we know the south pole is. Magnetic storms on the surface of the sun. Map showing the age of the atlantic ocean seafloor in millions of years versus the distance from the mid ocean ridge age 0.

Marine magnetic anomalies result from seafloor spreading in conjunction with choose one. As magma cools particles in it get frozen in the direction of the. We have already seen how the recording of magnetic reversals led to the confirmation of the seafloor spreading hypothesis. Magnetic reversals and sea floor striping a key factor in establishing the theory of plate tectonics was recognition of past reversals in the earth s magnetic field and the mapping of normal and reverse magnetic striping on the ocean floor.

The study of the earth s magnetic field as recorded in the rock record was an important key in reconstructing the history of plate motions.