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Geologists generally are aware of the connection between Reykjanes Ridge and Kolbeinsey Ridge. Here, the relevant convection roll is marked with red line for the up-welling division, and blue line for the down-welling part. By comparing with the exact location of the two ridges, the reason for the connection between them becomes clear.

As latitude and longitude can be easily detected on this map, the consistence between real location and this theoretic alignment can be checked out.

The cnvection roll of Reykjanes Ridge is originally connected at 120 km depth with the tectonic plate, but within the intersection zone it becomes subducted by the polar convection rolls. North of the intersection zone, the convection roll found in between the blue and red lines is also connected with the tectonic plate at 120 km depth, and it is also the upper most roll within the intersection zone.

Kolbeinsey Ridge follows a different path than Reykjanes Ridge, and seems to be a consequence of similar process as creates the volcanic zones of iceland. The Reykjanes Ridge is on the contrary directly related to a single up-welling division line.

The two ridges soutn and north of Iceland are actually of the same origin. This can be shown by comparing their location with the convection rolls model. This map shows the alignment of Kolbeinsey Ridge:

Within the interval of close to 63°N to 67°N, the two ridges are separated within the intersection zone of convection rolls.

Njörður Caldera is found within the Reykjanes Ridge:

The Reykjanes Ridge resembles a volcanic zone, as we see in Iceland. The volcano is found at a special location, where the upper most polar convection rolls division line does approach the division line between the equatorial convection rolls, responsible for the southern half of the Reykjanes Ridge. The faults stretching northwards from the caldera enter a micropolygon, shaped by four convection rolls layers.

The Reykjanes Ridge Polar Upper Mantle Rolls Division Line is up-welling, and works agains the drift direction of the North American Tectonic Plate, resulting in similar rifting process as within the volcanic zones of Iceland.

The Large Scale Lower Mantle Rolls are found deeper below, that is at 410 km depth. The Polar Upper Mantle Rolls upper limit is at 120 km depth, where the tectonic plate (the ductile part of it) meets with the convecting mantle.

Tristan da Cunha is centrally located according to this video

South Hemispher Tectonic Drift: https://www.facebook.com/GeomorphologyRules/videos/1868246676644895/

This video shows how the Atlantic Ocean devlopes from the center. Tristan da Cunha is found close to the ridge itself.

Juan de Fuca follows a convection rolls division line.

This arrangement is comparable to the Reykjanes Ridge and the volcanic zones in Iceland.

The ridge does originally not follow the main division line, because it is down-welling and therefor convergent.

The position of the two ridges can be compared:

Note that the main ridges are mainly found 1.5° west of the division line between large convection rolls of lower mantle.

Same kind of shift from western side to eastern side, a jump of 3°, is found in both cases. From the Reykjanes Ridge, a jump occurs to the East Volcanic Zone of Iceland, but at Juan de Fuca, a jump of 3° is found for the Gorda Ridge.

The fact that Juan de Fuca and Reykjanes Ridge show two aspects of consistency, that is they both follow the same formula of alignment, and are found 1.5° west of main division lined of lower mantle, is an argument for siting that the model is in harmony with real circumstances within the Earth’s mantle.

For reference, look for instance at

https://americastectonics.weebly.com/juan-de-fuca-explorer-and-gorda-plates.html