The Reykjanes Ridge and Kolbeinsey Ridge form a rather regular division line between tectonic plates, south and north of Iceland. In between the pattern is more complex. As for the convection rolls below, they are in a way more complex under Iceland, due to the transit zone of polar and equatorial convection rolls.
The two systems meet at 64°N, and both are subject to the same mathematical formula. If we trace the Reykjanes Ridge Convection Rolls, we find this picture:
I am a geologist, graduated from the University of Iceland, and taught geology for a few years. I have gained some knowledge about Earth's inner structure, so I provide this website as my contribution to answer one of the greatest questions remaining within the realm of geoscience. Experiments show that the mantle should form convection rolls when close to the melting point. I took this literally, and calculated the dimensions and shape of these mantle convection rolls. Then I compare that model with the surface. This makes it possible to provide many interesting examples about geology found on my blog.
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Magic Magma 