Explain how the water cycle is powered. In your own words, explain a journey that a water molecule could take from evaporation to percolation. Predict what would happen if a pollutant such as air pollution from burning fossil fuels enters groundwater. I'm sorry! I just have a project due and I don't understand any of this so please help me if you know this or took the Biogeochemical Cycles Booklet thing. Thank you.