Flexi Says: Water cycle processes that can purify water include evaporation and percolation. When water evaporates, water molecules move into the air as water vapor. Other particles, including pollutants, are left behind in the liquid. During percolation, liquid water (runoff) seeps downward through soil and rock layers until it reaches the water table. In this process, pollutants and impurities may be left behind in the soil and rock.
