Which sequence accurately describes the three zones of stream pollution?

The sequence "Degradation, decomposition, recovery" accurately describes the three zones of stream pollution. This sequence reflects the natural progression of a stream's water quality in response to pollution.

Initially, when pollutants enter a stream, the process of degradation occurs. This phase is characterized by the deterioration of water quality due to the introduction of contaminants, which negatively impacts the aquatic ecosystem.

Following degradation, the next phase is decomposition. During this stage, organic material and pollutants begin to break down. Bacteria and other microorganisms play a crucial role in this process, as they decompose organic matter, utilizing oxygen and further influencing the ecosystem's health.

Finally, the recovery phase occurs when conditions start to improve. After the pollutants have been decomposed and the impacts of degradation have diminished, the stream can begin to restore its ecological balance. In this phase, healthy biological communities can re-establish, and water quality improves as the stream regains its capacity to support life.

This sequence is fundamental in understanding how streams respond to pollution and emphasizes the importance of effective pollution management strategies to facilitate recovery and maintain ecological integrity.