Geography Sea Floor Spreading

Palaeomagnetism evidence of sea floor spreading is gained from an examination of the polarity of the rocks that make up the ocean floor.

Geography sea floor spreading.

Iron particles in lava are aligned with the earth s magnetic field. Seafloor spreading is a geologic process in which tectonic plates large slabs of earth s lithosphere split apart from each other. 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.

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. The theory of sea floor spreading states that new oceanic crust is being formed continuously at mid oceanic ridges while the older rocks move away from the ridge. Mantle convection is the slow churn ing motion of earth s mantle. As plates move apart magma rises along the constructive plate margin forming new land along the boundary of the plates.

Verification of seafloor spreading. The validity of the theory of seafloor spreading by harry hess was confirmed most notably by paleomagnetism and ocean floor mapping. 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. That is it explains why the age thickness and density of the oceanic crust increases with distance from the mid oceanic ridge.

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. Seafloor spreading is a geologic process in which tectonic plate s large slabs of earth s lithosphere split apart from each other. Seafloor spreading and other tectonic activity processes are the result of mantle convection. Seafloor spreading and othe.

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