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 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 have a BS degree in geology, BA in anthropology, graduated in Chinese language and as a certified tourist guide. I provide this website about my contribution to answer the greatest question remaining about our Earth. I have analyzed the convection rolls within the Earth's mantle and how they affect the surface. This makes it possible to provide many interesting examples about geology found on my blog.
View all posts by Steingrimur Thorbjarnarson