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1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. Surface Water- freshwater on Earth’s land surfaces River System- A flowing network of river and streams draining in a river basin Watershed –area of land that is drained by a water system Ground Water- water that is beneath the Earth’s surface Aquifer- a body of rock or sediment that stores groundwater and allows the flow groundwater Porosity- the percentage of the total volume of a rock or sediment that consists of open spaces Permeability- The ability of a rock or sediment to let fluids pass through its open spaces or pores Recharge zone- an area in which water travels downward to become part of an aquifer Pathogen-a virus, microorganism, or other substance that causes disease, and infectious agent Irrigation-a method of providing plants with water from sources other than direct precipitation Dam- a structure built across a river to control the river’s flow Reservoir- an artificial body of water the usually forms behind a dam. Desalination- a process of removing salt from ocean water Potable- suitable for drinking