changes of current across the kozlov changes of current across the river, they just the kozlov changes anything that sticks out gets not dob in eventually, you have this perfect disc. so the river freezes, but it is not completely frozen. what i think and has formed in this place? if you notice in some of the videos you can see online of this disc, there isjust a little bit of a curve in the river and a change in geometry which causes the flow of the river to shift over the one size and that causes just a gradient in the forces acting on the ice as the water flows back, flows underneath it, and therefore starts turning. it is pushing a little harder on one side of this ice on the other, which helps it to them. ifi the other, which helps it to them. if i understand you write, it would not form in lakes, there have to be differentiation and occurrence. not form in lakes, there have to be differentiation and occurrencelj not form in lakes, there have to be differentiation and occurrence. i do not know that this has ever been observed in a lake. all the videos i have seen have been in rive