Knee pain and popping is a common problem and can be caused by a number of factors. Another term commonly used for popping in the knee is Crepitus, which essentially means a noisy joint, whether it be popping, clicking, cracking or snapping.
The final type of erosion is attrition. Attrition is a way of eroding the riverâs load, not the bed and banks. Attrition is where pieces of rock in the riverâs load knock together, breaking chunks of rock off of one another and gradually rounding and shrinking the load.
Rivers erode in four ways: Abrasion or corrasion-This is when large pieces of bedload material wear away the river banks and bed. Attrition-This is when the bed load itself is eroded when sediment particles knock against the bed or each other and break, becoming more rounded and smaller. Hydraulic Action-This is when the force of water erodes softer rock. Solution or corrosion-This is when acidic water erodes rock.