Students graph the ratio of fresh vs. salty water on Earth. They research the source of their water and how much they use daily. Students learn about desalination, and how filtration cleans wastewater.

Student Resources

• 4.1 Vocabulary
• 4.2 Graphing Earth's Water Resources
• 4.3 Where Does Your Drinking Water Come From?
• 4.4 How Much Water Do You Use?
• 4.5 Desalination: Making Fresh Water from Salt Water
• 4.6 Section 4 Assessment