The three volcanoes; Hekla, Snæfellsjökull and Snæfell, are distributed in a regular way. As can be seen on the map below, Snæfellsjökull and Snæfell are on the same latitude, and Hekla is found on the longitude exactly in the middle. Therefore, a triangle appears on the map when lines are drawn between these volcanoes.
Also, this triangle is consistent with the convection rolls analysis, as Snæfellsjökull and Snæfell have similar positions relative to the division lines found on the map. Hekla is found on crossings of division lines.
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 