The change from a higher to a lower level of quality as exemplified by the reduction in the quality of surface water is called degradation.
What is degradation?
Degradation is the deleterious change in the chemical structure, physical properties or appearance of a material from natural or artificial exposure.
Degradation can also involve a reduction in the quality of a substance.
According to this question, acid rain is said to reduce the quality of surface water that damages fish life.
Therefore, this change from a higher to a lower level of quality as exemplified by the reduction in the quality of surface water is called degradation.
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