Having recently discovered that torus-shaped planets can actually form, I've started to consider using that design as a setting for a map(no real purpose in mind, just map making for the sake of it). How would I realistically simulate the formation of landmasses?
Artifexian has a great video on this subject on YouTube! In it he explains that due to the inner radius being smaller than the outer, continental plates moving inward will need to shrink and thus experience folding, creating mountains. Plates moving outward will have to grow and thus are torn apart. The surface gravity on the 'equators' is also lower than at the poles (slightly inside of the poles it is at a maximum) which makes for very large mountains.