I've had the same question, the answer is longitude.
Answer:
Slumping is the process that has a big influence on the river channel, as it can change its flow and volume.
Explanation:
Slumping happens when the erosion moved the bottom of the valley. This is the ground moving towards down when the rocks and mass of ground are moving downhill. This process influences the river, as the rock is, for example moving down, and the water runs into the rock, the water will go around the rock and that way change the flow.
Answer:
I'm not sure but I think it is convection.
Tenton Range, The Rocky mountains, the Jackson Hole.