Around the 64.75°N parallel the polygons are suspiciously marked by volcanic zones. It becomes quite appearent when colouring them red.
The central division line (wide black line) of lower mantle large convection rolls thereby has three polygons at each side most affected by the flow of magma to the east and west from that line at the depth of 410 km and thereunder.
Published by Steingrimur Thorbjarnarson
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 