Over a long period of time, running water in a river erodes the riverbed. this erosion causes the river to become wider and deeper.
The ground which a river flows over is referred to as riverbed.
Erosion is more effective on the downstream side of a meander due to the slope of the channel.
Thus, over a long period of time, running water in a river erodes the riverbed. this erosion causes the river to become wider and deeper.
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