Today africa and asia are connected by the triangle of the sinai peninsula. Berann it was published as a supplement to the june 1968 issue of national geographic magazine.
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The north american and eurasian tectonic plates for example are separated by the mid atlantic ridge.
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National geographic sea floor spreading. The earths crust is broken up into a series of massive sections called plates. Mapping the sea floor with the multibeam echosounder and the moving vessel profiler duration. Eventually the crust cracks.
The indian ocean flooded the rift valley between the continents creating the red sea. Seafloor spreading occurs along mid ocean ridgeslarge mountain ranges rising from the ocean floor. Seafloor spreading s ea f lo o r s p rea d in g is a g eo lo g ic p ro c es s in w h ic h t ec t o n ic p la t es la rg e s la b s o f ea rt h s lit h o s p h ere s p lit a p a rt f ro m ea c h o t h er.
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. The mid atlantic ridge stands out in glorious detail on this map of the atlantic ocean floor by bruce heezen and marie tharp. As the seafloor grows wider the continents on opposite sides of the ridge move away from each other.
Seafloor spreading is most dynamic along giant underwater mountain ranges known as mid ocean ridge s. Canada foundation for innovation fondation canadienne pour linnovation 51930 views. Seafloor spreading occurs at divergent plate boundaries.
The earths surface may seem motionless most of the time but its actually always moving ever so slowly at a scale that is difficult for humans to perceive. These tectonic plates rest upon the convecting mantle which causes them to move. The less dense material rises often forming a mountain or elevated area of the seafloor.
The mid atlantic ridge for instance separates the north american plate from the eurasian plate and the south american plate from the african plate. Seafloor spreading caused the arabian and african plates to rift apart. Painted by heinrich c.
As tectonic plates slowly move away from each other heat from the mantles convection currents makes the crust more plastic and less dense.
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