Since this post has such an idiotic answer, I'll explain it. During flooding the force of the current cuts across narrow bends, making the river shift to the new channel. Sometimes obstructions in a river will cause the current to divert and cut a new channel in a different direction around the obstruction. Rivers have also been know to change course because of earthquakes, as did the Mississippi River in 1811 (New Madrid earthquake).
the course changed because the consequences
With his superstrength alone, he would be able to change the course of a river. So, yes. Superman isn't real
gravity
.
Please rephrase - the question is unclear.
what happened to the Mississippi river in 1812
Erosion effects the Mississippi river by causing collapse in the banks of the river. Erosion also causes the river to change course slightly as the banks change.
Glaciers from the last ice age changed the course of this river and many others. Luckily we are currently in between ice ages by thousands of years.
Allopatric speciation.
An avulsive cutoff is either end of an avulsion - the abrupt change in the course of a river.
A river is young if it has an oxbow lake. Erosion and deposits of soil cause crescent shaped oxbow lakes along a river and change the river's course.
The river's course is its route; where it goes.