The movement of different sized particles due to gravity and due to water transport.
Particles of different sizes are sorted through transport and the loss of energy during that transport.
More correctly, the two demonstrations apply to transport driven only by gravity and transport driven by another medium. The demonstration using water will also apply to aeolian (wind) transport, such as during the formation of sand dunes.
Update 07.03.2023: Grady at Practical Engineering has just released a great video on this topic • Why Rivers Move
Watch his, it's better. Really.
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