What is the term for the process of moving stones along a riverbed?

The term that describes the process of moving stones along a riverbed is known as traction. This process involves larger, heavier particles that roll or slide along the riverbed due to the force of the water current. Traction is essential in river systems as it contributes to the erosion of the riverbed and the shaping of riverbanks.

In contrast, other processes like saltation refer to smaller particles that are lifted and dropped in a leap-frog motion, while suspension describes finer particles that are carried within the water column itself. Solution involves the dissolving of minerals and rocks in water, which contributes to sediment transportation but does not involve solid stones moving along the riverbed. Therefore, traction is the most accurate term for the movement of larger stones along a riverbed, making it the correct answer.