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The rift valley of Thingvellir is found at the point where the western edge of the West Volcanic Zone of Iceland intersects the N-S axis of the relevant polygon of mantle convection rolls division lines. The location is shown here:

The Rift Valley is the most valued of any place in Iceland, the No. 1 National Park, established in 1930 on the occasion of the 1000th anniversary of the National Assembly of Althingi. Usually, the part of the Rift Valley called Almannagjá is filled with visitors, but this time not, during summer 2020.

The cliffs to the west mark the western boundary of the West Volcanic Zone. Within the Volcanic Zone, this area is a part of the Hengill Volcanic System. According to the Convection Rolls System, the SW-NE alignment of the Volcanic System, and the N-S axis of the Thingvellir Polygon, intersect here. The polygon has a basic trend of breking up along the N-S axis, so therefore the Rift Valley of Thingvellir becomes specially prominent in this area.

The arrangement of sea and landmass along equator is regular as shown here:

The pattern along equaor of 30° span of S-America, 60° span of Atlantic Ocean, 30° of Africa from west coast to Great Rift Valley, 60° from Great Rift Valley to Indonesia, 30° from west coast of Indonesia to east coast of Indonesia, is quite obvious. Moreover, the pattern fits with the arrrangement of convection rolls within the mantle, considering that mantle material convects in rolls of equal hight and width under balanced conditions of flow.

The proof is found with the location of the Great Rift Valley, as it is not found in context with coast-to-coast distance, but from the west coast of Africa over to a geological phenomena within the continent, that is clearly there due to the inner forces of Earth.

To further examine the distribution of geological features, one can ‘zoom in’ on the Great Rift Valley, and see how it does comply in detail with the upper most convection rolls, close to the tectonic plate.

At equator, the Great Rift Valley is divided into two main parts, described in Wikipedia: https://en.wikipedia.org/wiki/Great_Rift_Valley. The western rift, called Albertine Rift and the eastern rift, called Gregory Rift, together span 9° from east to west along equator. The convection rolls responsible for the formations are shown here:

Each convection roll spans 1.5° from east to west, making the effects on the surface quite understandable. The rifting process is therefore subject to three upwelling sites, whereas the outer margins are marked by downwelling division lines between mantle convection rolls.

Note: A tectonic plate is 120 km thick structure, with a brittle upper part and ductile lower part. The transformation from the rigid structure of tectonic plate, to the flowing nature of mantle material takes place 120 km below the surface. Therefore, adiabatic temperature gradient is found below 120 km depth (described in: Volcanoes: A Planetary Perspective: Written by Peter Francis, 1993 Edition, Publisher: Clarendon).

The Aegir Ridge is a huge geological feature, in between Iceland and Norway. The Wikipedia descirption of it is here: https://en.wikipedia.org/wiki/Aegir_Ridge. It was responsible for the opening of the Atlantic Ocean at the relevant latitudes, but is now extinct and drifts along with the Eurasian Tectonic Plate.

All the same, the Aegir Ridge shows resemblence with the tectonic arrangement of Iceland. Moreover, it is all in accordance with the convection rolls system, as shown here:

The Aegir Ridge, as seen on this Google Map, is aligned E-W at the latitude of 64°50′, where the main tectonic features of Iceland make a turn from NE-SW (south of the line) to N-S (north of the line). The northern part of Aegir Ridge follows the same alignment as the upper most convection rolls of 120 km depth. The central line is the tenth convection roll division line counted from the Reykjanes Ridge convection rolls division line. That is half the span of the large convecton roll extending from Iceland to Norway, as each large scale roll spans 30° from east to west. Small scale rolls span 1.5° from east to west.

The convection rolls under the tectonic plates can be represented with short sections. The most obvious example is found under the Atlantic Ocean.

These large scale convection rolls span 30` along each latitude, as shown below.

These drawings can then be used for a first step learning to be able to understand the Convection Rolls System. The convection rolls shaping the Atlantic Ocean were in fact first noticed a long time ago, but attention was mainly directed towards surface features. Alfred Wegener noticed that the continents fit together, and was clear-headed enough to see that it could be no coincidence. Then he systematically studied each side of the Atlantic, and other parts of the world, to find the global picture of tectonic drift. In the same way, we can make use of the clarity of structure of the Atlantic Ocean to understand the forces responsible for tectonic drift, volcanic activity and formation of geothermal areas.