At first sight, the Atlantic and Indian Oceans look different, but at equator they are geologically identical. Both cover 60° along the equatorial line, and both have a mid-ocean ridge as a central point.
Let us start with the Amazon Estuary, a point exactly on the equatorial line. The flow of water is of geological scale, and the annual isostatically vertical movement is measured to be 8 centimeters a year. It is understandable that this water flow does search out a weakness of the crust for reaching out to the ocean. 30° farther east, the Mid-Atlantic Ridge crosses the equator line, being almost aligned directly east-west over considerable distance. Then the ridge makes a sharp turn towards the south, and keeps that alignment within the south hemisphere. 30° farther east, we find the African West Coast, at the coastal line which most clearly appeared as a jigsaw puzzle line fitting to the coast of S-America. Then, 30° farther east, the Great Rift Valley of Africa is clearly found above some main division underneath, pulling the ground, bringing geothermal and volcanic activity to the surface. Then, 30° farther east, the Central Indian Ridge crosses the equatorial line, and at the same spot makes a turn directly southwards, in a similar way as the Mid-Atlantic Ridge. Then, 30° farther east, does the Sumatran Subduction Zone cross the equatorial line. It is a coastal point as well, at the small islands found close to the coast of Sumatra.
Comparing the Atlantic and the Indian Ocean does therefore make some sense. The tectonic drift is constantly altering the appearance of the oceans and continents, and comparing the Amazon Estuary with the Great Rift Valley, the Central Indian Ridge with the Mid-Atlantic Ridge, and the African West Coast with the Sumatran Subduction Zone, might sound absurd at first, but these are all spots found 30° away from each other along the most prominent single line on Earth -equator.
Some information can be found here: Amazon – https://www.scielo.br/j/bjgeo/a/JMM96kwnm8NwRpjMbgbrsYD/?lang=en, Great Rift Valley – https://www.cbsd.org/cms/lib/PA01916442/Centricity/Domain/1803/Great%20Rift%20Valley.pdf
Magic Magma 