Sea Floor Spreading Geography

The concept of sea floor spreading. Seafloor spreading theory that oceanic crust forms along submarine mountain zones known collectively as the mid ocean ridge system and spreads out laterally away from them. 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.

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Seafloor spreading occurs along mid ocean ridges large mountain ranges rising from the ocean floor.

Sea floor spreading geography.

He suggested that new sea floor forms at the oceanic ridges and spread outwards from the line of origin. The concept of seafloor spreading was put forward by h harry hess an american geologist. The mid atlantic ridge for instance separates the north american plate from the eurasian plate and the south american plate from the african plate. World war ii gave scientists the tools to find the mechanism for continental drift that had eluded wegener.

When any rock containing iron is formed such as iron rich ocean floor basalt it is magnetized so that the iron rich grains become aligned with earth s magnetic field. Verification of seafloor spreading. This idea played a pivotal role in the development of the theory of plate tectonics which revolutionized geologic thought during the last quarter of the 20th century. The formation of the new crust is due to the rising of the molten material magma from the mantle by convection current.

Further he claimed that continents would be pushed aside by the same forces that cause the ocean to grow. The validity of the theory of seafloor spreading by harry hess was confirmed most notably by paleomagnetism and ocean floor mapping. Palaeomagnetism evidence of sea floor spreading is gained from an examination of the polarity of the rocks that make up the ocean floor. Iron particles in lava are aligned with the earth s magnetic field.

The process of sea floor spreading the mid ocean ridge is the region where new oceanic crust is created. This hypothesis traces oceanic crust from its origin at a mid ocean ridge to its destruction at a deep sea trench and is the mechanism for continental drift during world war ii battleships and submarines carried echo sounders to locate enemy submarines. Enjoy the videos and music you love upload original content and share it all with friends family and the world on youtube. 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 plate the cocos plate the nazca plate and the antarctic plate.

As plates move apart magma rises along the constructive plate margin forming new land along the boundary of the plates. Maps and other data gathered during the war allowed scientists to develop the seafloor spreading hypothesis. The oceanic crust is composed of rocks that move away from the ridge as new crust is being formed.