Color image of forest floor with "What the heck is in rain, and where does it come from?"

Examples of what rain can pick up when it falls through the atmosphere and to the ground:

Text box that reads: If fate decides that the drop of rain on the canopy of a tree in the forest, and falls to the ground below, it will pick up even more materials. Organic matter, pollen, fungal spores, particulates, bugs, and other pollutants that cling to the tree during the dry period between storms can get transported with water to the forest floor in throughfall or stemflow.  Throughfall is the water that falls through or drips from the forest canopies and stempflow is what flows down tree stems. 
banner with text, some materials dissolve in the rain impacting color to the water. other materials remain suspended in water and can be separated with filtration
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