The table below shows the four processes of river erosion. What type is number 4?
1. The force of the water breaks rock particles away from the river bed
2. Rocks carried by the water wear down the river bed and banks
3. Rocks carried by the water crash into each other and wear each other down
4. Some rock – like limestone – dissolves in the water
The type of erosion described in number 4 is chemical erosion (or chemical weathering).
This occurs when certain types of rocks, such as limestone, dissolve in water due to chemical reactions, particularly when the water is slightly acidic (often due to dissolved carbon dioxide). This process contributes to shaping the riverbed and altering the landscape over time.
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