In 2010 Eyjafjallajökull eurupted. Its location is interesting, as the crater is in the middle of a polygon. It is directly south of Hekla, which is in the north corner of the same polygon. The craters of Vatnafjöll and Tindfjöll are also on that line.
The elliptical form around the crater of Eyjafjallajökull, exactly in the middle of the polygon. Hekla marks the northern corner of the polygon.
Countless examples like this one show how the convection rolls shape the surface.
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 