Empowering Global Citizens For example, for topic 1, the students may make a map showing the ma jor bodies of freshwater and the major bodies of salt water, noting which countries have access to each and which have access to neither. The students may also create a graph that shows the ratio of freshwater to salt water on the planet. They may make tables indicating the primary methods that in— dividuals use to access freshwater around the world. The students may do a brief investigation of where their freshwater comes from (e.g., a water table or an aquifer) and of how it gets to them. Activity 13.1.3 Silent Spring Students read Rachel Carson’s book Silent Spring outside of class in prepara— tion for the next two units. 317