Magma continuously wells upwards at the mid-oceanic ridges (arrows) producing currents of magma flowing in opposite directions and thus generating the forces that pull the sea floor apart at the mid-oceanic ridges. As the ocean floor is spread apart cracks appear in the middle of the ridges allowing molten magma to surface through the cracks to form the newest ocean floor.
http://www.ucmp.berkeley.edu/geology/tecmech.html
That's what it says but I disagree with the sentence you highlighted.
The upwelling comes after the crust is fractured. The upwelling is the effect.
There wouldn't be an upwelling without a fracture.
It's a question of what came first, the fracturing or the mantle currents. If the fracturing came first, then we have evidence for the flood.
http://www.ucmp.berkeley.edu/geology/tecmech.html
The upwelling comes first which creates the force necessary to fracture the crust.
That's what it says but I disagree with the sentence you highlighted.
The upwelling comes after the crust is fractured. The upwelling is the effect.
There wouldn't be an upwelling without a fracture.
It's a question of what came first, the fracturing or the mantle currents. If the fracturing came first, then we have evidence for the flood.
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