After the second world war the understanding of ocean floor significantly changed.
Seafloor spreading theory upsc notes.
E g tidal forces and centrifugal forces are too small to bring such changes magnetite striping and seafloor spreading pacific ring of fire etc.
This theory is based on the 2 principle hypothesis arthur holmes convection current hypothesis and the concept of seafloor spreading advocated by hess.
Cold seawater cools and solidifies this magma to form new.
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.
Theory given by harry hess according to him sea floor spreading occurs in divergent plate boundaries i e.
The concept of seafloor spreading was put forward by h harry hess an american geologist.
Body after mentioning that theory of plate tectonics is an improvement over theory of continental drift divide the body into parts and present evidences facts in favour of your stand.
Tectonic plates move away from each other due to thermal convective currents this leads to fractures and cracks in the earth s oceanic crust which is filled up with magma bubbling up from earth s mantle aesthenosphere.
Seafloor spreading theory mapping of the ocean floor.
The development towards the theory began in the 1960s with extensive seafloor mapping.
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.
It is an improvement over the wegener s continental drift theory and has been considered as the most.
Start studying sea floor spreading notes.
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.
Also the following six developments were instrumental in the formulation of the theory of plate tectonics.
Sea floor spreading notes jenny 1.
He suggested that new sea floor forms at the oceanic ridges and spread outwards from the line of origin.
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With the emergence of the concept of seafloor spreading and wealth of new evidence at the beginning of the 1950s and 1960s the interest in the problem of distributions of oceans and continents was revived.
Seafloor spreading occurs along mid ocean ridges large mountain ranges rising from the ocean floor.
Further he claimed that continents would be pushed aside by the same forces that cause the ocean to grow.
