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.
Sea floor spreading diagram upsc.
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.
Seafloor spreading occurs along mid ocean ridges large mountain ranges rising from the ocean floor.
Occurs due to mantle convection.
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 and othe.
See also continental drift a veritable legion of evidence supports the seafloor spreading hypothesis.
Seafloor spreading is a process that occurs at mid oceanic ridges where new oceanic crust is formed through volcanic activity and then gradually moves away from the ridge.
Seafloor spreading is a geologic process in which tectonic plates large slabs of earth s lithosphere split apart from each other.
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.
Discuss how and why earthquakes and volcanoes are common at the oceanic trenches and mid oceanic ridges respectively.
Further he claimed that continents would be pushed aside by the same forces that cause the ocean to grow.
Draw a diagram to explain the mechanism more clearly.
It leads to the formation of new material on the ridge.
In the main body discuss.
Paleomagnetism led the revival of the continental drift hypothesis and its transformation into theories of sea floor spreading and plate tectonics.
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.
Sea floor spreading theory.
Introduction explain what sea floor spreading is.
In the introduction explain the concept of seafloor spreading.
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.
The concept of seafloor spreading was put forward by h harry hess an american geologist.
Use suitable diagrams to ensure the content is holistically conveyed.
Mention details of the characteristic features of mid atlantic ridges.
