I want to give a fragment from the discussion "The location of coral reefs in space most often has a linear shape. What is it connected with?". Here about the straightness of the bottom topography in the shallow areas of the tropical zone.

«It is generally accepted that for the formation of a coral reef, clear water is necessary (photosynthesis of zooxinela is impossible in muddy water) and warm water (in cold water, a polyp cannot form an external carbonate skeleton). In addition, it is desirable to have a solid substrate for fixing the polyp at the bottom and sea currents that bring food to the polyp are desirable.

In tropical seas, these conditions are everywhere, but coral reefs are not formed everywhere. The reason is that the tropical zone of the ocean is oligotrophic. For the first time, we have included in the list of necessary conditions a fluid dynamic process in tectonic faults of the earth's crust. You can see the link: https://magazine.neftegaz.ru/articles/geologorazvedka/443409-flyuidodinamicheskie-anomalii-kaspiyskogo-morya/.

This led to the need to formulate a new paradigm for the formation of coral reefs. We did this in the second volume (Spatial patterns of coral reef formation) of the monograph "A new paradigm of accumulative relief formation in shallow areas of oceans and seas" (2021).

It was shown for the first time that in the oligotrophic tropical zone of the ocean, solutions of phosphates and nitrates enter the bottom layer only along tectonic faults. Without these substances, phytoplankton cannot form. Without phytoplankton, zooplankton (polyp food) cannot arise. We used the theory of structure formation of the solid shell of the Earth.

Block sizes change discretely (… 35x35 km, 70x70 km, 140x140 km, 280x280 km, 560x560 km, 1120x1120 km …). The orientation of the block structure is discrete (0° and 270°; 17° and 287°; 35° and 305°; 45° and 315°; 62° and 332°; 77° and 347°).

Solutions of nitrogen and phosphorus enter the oligotrophic waters of the ocean only along straight faults. Linear fault directions can only have six azimuths. Coral reefs only form along faults. Let's apply a new coral reef formation paradigm to a coral reef in the Amazon Delta. I have attached a diagram of this reef and a satellite image of the Amazon Delta with our additions. (Scheme of a coral reef from an open Internet resource).

The grid of tectonic blocks is like a chessboard. The white squares are up and the adjacent black squares are down. On the satellite image, I put a yellow line (approximate position of the coral reef). To this line, I leaned a square with dimensions of 1120x1120 km with an azimuth of 35° and 305°. The line of the coral reef and the northeastern boundary of the tectonic block coincided.

The correctness of drawing a tectonic block on a satellite image has several practical confirmations. The arrow in the image shows a tectonic fault, which manifested itself in the configuration of the ocean coast. The bay has an azimuth of 35 degrees. In the north-west direction, at a distance of about 560 km, you can see a similar bay (tectonic fault). This is natural, since the tectonic block 1120x1120 km is divided into 4 blocks. The adjacent block is shown in red. It is shown in the terrain as an uplift. I think it's convincing.

If there are doubts about the theory of fluid dynamics, I will provide additional evidence. In the picture, I showed in blue a tectonic block, which has dimensions of 560x560 km. It has a different spatial orientation (77° and 347°). Along the northern and western borders of the block, you can see straight riverbeds. This can be explained only by the theory of fluid dynamics of the lithosphere. All riverbeds coincide with tectonic faults. Thank you for watching.

Sincerely, Boris.