Gilbert reverse 3 40 to 5 3 ma.
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Matuyama reverse 0 73 to 2 48 million years ago ma gauss normal 2 48 to 3 40 ma.
In the places where the plates are moving apart magma liquid rock moves up into the cracks and solidifies making a new ocean floor just like cake batter would ooze up through.
On this section of the seafloor the history of earth s magnetic field that is revealed includes the following periods.
Seafloor spreading is a process that occurs at mid ocean ridges where new oceanic crust is formed through volcanic activity and then gradually moves away from the ridge.
The mid atlantic ridge for instance separates the north american plate from the eurasian plate and the south american plate from the african plate the east pacific rise is a mid ocean ridge that runs through the eastern pacific ocean and separates the pacific plate from the north american.
Seafloor spreading definition a process in which new ocean floor is created as molten material from the earth s mantle rises in margins between plates or ridges and spreads out.
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Earlier theories by alfred wegener and alexander du toit of continental drift postulated that.
Seafloor spreading occurs along mid ocean ridges large mountain ranges rising from the ocean floor.
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Seafloor spreading theory that oceanic crust forms along submarine mountain zones and spreads out laterally away from them.
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Brunhes normal present time to 730 thousand years ago.