Sea Floor Spreading Diagram Upsc

Introduction explain what sea floor spreading is.

Sea floor spreading diagram upsc.

Further he claimed that continents would be pushed aside by the same forces that cause the ocean to grow. As per seafloor spreading theory the mid oceanic ridge is the region where at the crest of oceanic ridges through the rupture of the oceanic crust and the crack continuous new lava eruption thrusts into it consequently pushing the oceanic crust on either side. Discuss how and why earthquakes and volcanoes are common at the oceanic trenches and mid oceanic ridges respectively. Seafloor spreading is a geologic process in which tectonic plates large slabs of earth s lithosphere split apart from each other.

Paleomagnetism led the revival of the continental drift hypothesis and its transformation into theories of sea floor spreading and plate tectonics. Strong evidence of seafloor spreading and plate tectonics. Matthews used paleomagnetism to test the theory of seafloor spreading by studying paleomagnetic data from a portion of the midocean ridge system if the seafloor has spread laterally by the addition of new crust at the oceanic ridges there should be a relatively symmetrical pattern of magnetic orientation normal polarity reversed polarity normal polarity and. Wherever continents are bordered by deep sea trench systems as in the pacific ocean the ocean floor is plunged downward underthrusting the continents and ultimately reentering and dissolving in earth s mantle from which it had originated.

Use suitable diagrams to ensure the content is holistically conveyed. See also continental drift a veritable legion of evidence supports the seafloor spreading hypothesis. Seafloor spreading and othe. Body give evidences in favour of seafloor spreading which led hess to give this theory.

He suggested that new sea floor forms at the oceanic ridges and spread outwards from the line of origin. It leads to the formation of new material on the ridge. Seafloor spreading is an endo genetic process occurring at divergent plate boundaries. The concept of seafloor spreading was put forward by h harry hess an american geologist.

In the introduction explain the concept of seafloor spreading. 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. In 1963 fred vine and d h. The concept of sea floor spreading.

Mention details of the characteristic features of mid atlantic ridges. Sea floor spreading theory. The regions that hold the unique record of earth s magnetic field lie along the mid ocean ridges where the sea floor is spreading. In the main body discuss.

Occurs due to mantle convection. Draw a diagram to explain the mechanism more clearly.