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.
Cylindrical cuts into river rock are also called potholes, sometimes kettle holes, and are due to erosion of the rock over eons of time. To fishermen, it can be a good area for angling. Where geology and time have dried up those beds, chasms remain.