The similarity between Central Africa, Amazon and Indonesia is quite striking. The three areas are found at equator, span 30°, and are found with 60° interval. Also, volcanic and tectonic activity is found in context with the relevant mantle convection division lines, marking the large scale polygon.
The African Polygon
The volcanic activity in eastern Africa is related to the Great Rift Valley, which is closely related to the tectonics formed by the east corner of the polygon of Central Africa.
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 