The correct order is usually splash erosion, followed by sheet erosion, then rill erosion, and finally gully erosion. "Roll" is not a recognized stage in the erosion process, and it seems to be a misunderstanding of the term "rill erosion" which refers to small, parallel channels.
Splash erosion: This is the initial stage where raindrops dislodge soil particles.
Sheet erosion: Water flows in a thin sheet across the land, removing a uniform layer of soil.
Rill erosion: Water concentrates into small, narrow channels, and these channels are called rills.
Gully erosion: Rills grow into larger, deeper channels called gullies.
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