Environmental Science 15th Edition by Scott Spoolman,Tyler Miller

Exercise 19

What are the two key concepts for this section? Define freshwater. Explain why access to water is a health issue, an economic issue, a national and global security issue, and an environmental issue. What percentage of the earth's freshwater is available to us? Explain how water is recycled by the hydrologic cycle and how human activities can interfere with this cycle. Define groundwater , zone of saturation , water table , aquifer , surface water , surface runoff , watershed (drainage basin) , and reliable surface runoff.