Magnetic Reversals On The Ocean Floor

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Magnetic reversals on the ocean floor.

Morley frederick john vine and drummond hoyle matthews made. The area of in between depths e g. It was determined that the rock of the ocean floor had bands of embedded iron oxides that alternately pointed toward geographic north and geographic south. Where the ocean is about 1 kilometer deep is much less.

Explains how magnetic polarity frozen into seafloor basalts reveals evidence for the creation of new seafloor at mid ocean ridges. Most dry land has a modest elevation above sea level while most of the ocean floor is about 3 kilometers or 2 miles lower down. Plate tectonics and reversals of the earth s magnetic field are responsible for the magnetic stripes found on the ocean floor. Past field reversals can be and have been recorded in the frozen ferromagnetic or more accurately ferrimagnetic minerals of consolidated sedimentary deposits or cooled volcanic flows on land.

When magma flows out of a mid ocean ridge small magnetic minerals in the magma align themselves to point in the direction of the earth s current magnetic north. It is known that leading up to a magnetic reversal the strength of the field. How magnetic reversals on the seafloor provide evidence for seafloor spreading.