Water and boundaries
Accretion
The gradual addition of land by natural deposit of soil along a waterway
Silt building up slowly along a riverbank adds to the owner’s land, and the new soil is called alluvion. The mirror process, erosion, gradually takes land away. Both change boundaries over time without any conveyance.
How the exam asks about it
Distinguish avulsion — a sudden, violent change such as a river abruptly shifting course. Avulsion generally does not change the boundary, precisely because it was not gradual.
Related terms
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