The two scenic spots of Þríhnúkagígur and Leitin are found near Reykjavík. The former is a crater with an empty magma chamber underneath. Now it is possible to enter the resulting cave, one of its kind in the world. The second is a crater very few people visit, but the lava from it created the Raufarhólshellir lava tube, known as the Lava Tunnel in tourism. It also created Rauðhólar pseudocraters and Tröllabörn hornitos in the same eruption, over 5000 years ago. Both craters are found along the mysterious 64th parallel.
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 