Video narration
A river may look steady today, but it’s always reshaping itself. As water flows downhill, it pushes and pulls on the ground with force. First comes erosion: faster water bites into the riverbank and riverbed, wearing them away. Next is transport: the current picks up that loose soil, sand, and small rocks and carries them downstream. Then comes deposition: where the water slows down—around a bend or on flatter ground—it can’t hold as much, so it drops the material. Over time, one bank gets carved back while the other side builds up, and the channel shifts, widens, or changes its path. So the river’s shape is a moving story written by flowing water: erode, carry, and deposit—again and again.