The process of dissolving by breaking into smaller pieces is called disintegration.
It is actually called weathering, but if your talking about the process of rocks breaking down into smaller pieces by physical means it is called Mechanical Weathering, by chemical means it is called Chemical Weathering.
The process of breaking igneous rocks into smaller pieces is called weathering. This can occur through physical weathering (such as frost wedging or abrasion) or chemical weathering (such as dissolution or hydrolysis).
The process of breaking down materials into smaller pieces is called fragmentation. This can occur through physical forces (like weathering and erosion) or through biological processes (such as digestion or decomposition).
The process you are referring to is called abrasion, which occurs when rocks are carried downstream by a river and collide with each other or the riverbed, causing them to break into smaller pieces.
That process is called the Digestion Process.
segmentation
In reference to glaciers or icebergs,when smaller pieces break off and fall away,it is called "calving", as though the parent ice formation were having a calf.
The process described is called mechanical weathering. It involves the physical disintegration of rock into smaller pieces through processes like frost-wedging, pressure release, and abrasion. These mechanical forces cause the rock to break apart into smaller fragments without changing its chemical composition.
The smaller pieces formed due to weathering are called sediment or particles. These can range in size from tiny clay particles to larger sand-sized grains, depending on the intensity of the weathering process.
The process you are referring to is called weathering. Weathering involves the physical forces of water, wind, temperature changes, and ice that break down rocks into smaller pieces over time.
The slow process that breaks rocks into smaller pieces is called weathering. This can happen through various mechanisms like physical weathering (e.g. freezing and thawing, root wedging) or chemical weathering (e.g. oxidation, hydrolysis).