In Borgarfjörður the area around Reykholt provides naturally about 400 liters per second of boiling hot water. The Reykjanes Ridge line to NE and the NW line of Hekla intersect there and create these extraordinary conditions.
Study area of Reykholt
The valleys are oriented E-W due to the outer pressure on the polygon. A cube of mainly ductile material breaks from one corner to the other). The combination of side pressure and heat source creates a geothermal area.
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 