Knowing about the mantle currents makes it possible for us to explain tectonics and topography. An EW-axis is found along Eyjafjallajökull through Fimmvörðuháls and farther to the east over the caldera of Katla. This is how it looks:
Try to look at Eyjafjallajökull and Mýrdalsjökull on Google Map yourself, and trace the EW-axis. The reason can be understood by referring to the pattern of magma currents under the tectonic plates of the Earth.
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.
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Magic Magma 