Why are rivers called self renewing resources?

Rivers are considered self-renewing resources because they continuously cycle water through the hydrological process, which includes evaporation, precipitation, and runoff. This natural cycle replenishes river systems, maintaining their flow and supporting ecosystems and human activities. Additionally, rivers receive inflows from rainfall, melting snow, and tributaries, further sustaining their water levels. However, their renewal can be affected by factors like climate change, pollution, and human activities.