The pair of convection rolls under the continental shelf of Norway along 66°N is shown here:
The Convection Rolls
You can go further and visualize the next convection roll to the east, under the Norwegian mountains, as they span more or less the width of one convection roll.
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 