gradual wearing away

See: erosion
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is the gradual wearing away of rock by wind or water.
The exact cause is not fully understood, although it is generally accepted that the gradual wearing away of joint cartilage tissue is a major contributing factor.
MS is caused by the gradual wearing away of the protective coating (myelin) that surrounds the nerve fibres.
Osteoarthritis, also called wear-and-tear arthritis, involves gradual wearing away of the smooth slippery cartilage that lines a joint.
erosion--the gradual wearing away of soil and rock as wind or water break them up and carry them away