Explain the various anthropogenic causes of the water cycle.

Explain why seasonal stratification of temperature and oxygen takes place in deep ponds and lakes.

What is the key concept for this section? Whatpercentage of available freshwater is lost throughinefficient use and other causes in the world and inthe United States? What are two major reasons forthose losses? Describe three major irrigation methodsand list ways to reduce water losses in irrigation. Listfour ways to reduce water waste in industries andhomes and three ways to use less water to removewastes. What is gray water? Describe Sandra Postel’sefforts to educate people about water supply issues.List four ways in which you can reduce your useand waste of water. What is a floodplain? List fourhuman activities that increase the threat of floodingand four ways to reduce our contribution to flooding

What are the two key concepts for this section?Define freshwater. Explain why access to water is ahealth issue, an economic issue, a national and globalsecurity issue, and an environmental issue. Whatpercentage of the earth’s freshwater is available to us?Explain how water is recycled by the hydrologic cycleand how human activities can interfere with thiscycle. Define groundwater, zone of saturation,water table, aquifer, surface water, surface runoff, and watershed basin