1. Who discovered the magnetic strips on the seafloor and how did they discover

Question

1. Who discovered the magnetic strips on the seafloor and how did they discover them?

B. How did these help to prove the theory of plate tectonics and how can they be used to determine how fast the seafloor is spreading?

c. What does it mean when we say that each side of the seafloor away from the mid ocean ridge is a mirror image of the other side?

2. Do outlines of continent match if they were moved back into position where they may have been when there was a supercontinent?

A. What are seamount chains and how can they measure the rate of seafloor movement?

B. How are island arcs formed?

C. How are seamount chains formed?

D. What are hot spots?

E. How are these used to calculate the rate of plate movement?

Explanation / Answer

1) Fritz Pfleumer discovered the magnetic strips. magnetic strips was first invented for recording sound in 1928 in Germany, based on the invention of magnetic wire recording by Valdemar Poulsen in 1898. His invention used and iron oxide powder coating on a long strip of paper.

B) the basic theory of plate tectonics is that along sea floor spreading zone the continents are separated from one another. FB spray department comes to the surface and becomes new Continental crust . at the tectonic plates move away from spreading zone they collide with one another. In some cases the ages of two different plate will grind against each other in horizontal fashion. These areas called transform boundaries experience many earthquake. A well known transform boundary in a San Andreas fault in California. in other cases the plates directly collide forcing one plate upward while the other plate is forced back into the mantal. Stripes of magnetic material is the sea floor provide a strong evidence for tectonic theory. The stripes alternate between doors with magnetic material orientated toward magnetic north and those oriented in the opposite direction. sea floor spreading is the mechanism behind this phenomenon. As new Magma forces its way up to the surface magnetized mineral in the liquid Rock Orient along the earth magnetic field and then Harden as the Lava cools. as studying continues the material moves away from the spreading zone as if on a conveyor belt. the earth magnetic field flips every few hundred thousand years and the stripes on the ocean floor show a record of those changes. by estimating when the Phillips occurred and pairing that with the distance the streets have moved from the spreading zone scientist and estimate how fast the continents are moving.

C) the sea floor was created at mid ocean ridges spreading in both direction from the ridge system. As the spreading centre, Liquid rock called basaltic magma Rises from the Earth Mantle as it upwells beneath the spreading axis. When the magma hardens IT firms new Oceanic crust that becomes welded to the original crust. reading is believed to be caused by far-field stresses and the upwelling of the Mantle beneath The spreading access is the passive response to plate separation. The oceanic trenches bordering the continent mark regions where the oldest Oceanic crust is reabsorbed into the Mantle through steeply inclind earthquake prone subduction zone. The pull of the deeply plunging lithosphere is one of the forces that may drive plate separation.

A) acemiz chain is a mountain rising from the ocean sea floor that does not reached to the water surface and thus is not an island, islet or cliff rock. It is possible to calculate the rate of sea floor movement of one side of a mid Ocean Ridge by dividing distance by time. This is called a half spreading rate. Multiply it by 2 to get the full spreading rate for both side of the Ridge.

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