Usually by erosion, although weathered rocks can split off to trigger a slide. A landslide is the downhill motion of loose rock and soil, sometimes entire layers of a mountainside.
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Meanders are formed by both erosion and deposition.
deposition
Deposition
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Meanders are formed by both erosion and deposition.
Deposition
deposition
Deposition
Creep is formed by erosion.
erosion
erosion
erosion
The Nile River is formed by Deposition.
erosion