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.
There are four main forms of river erosion: Hydraulic action-the force of the water wears away the river bank from underneath. Attrition-rocks being carried by the river smash together and break into smaller particles.here are four main forms of river erosion: Hydraulic action-the force of the water wears away the river bank from underneath. Attrition-rocks being carried by the river smash together and break into smaller particles.