Return to Unit List Grade 4   Unit D: Water and Weather     Chapter 8: Earth's Water   Lesson 1: Water, Water Everywhere   Summary   Quiz   Lesson 2: Follow the Water   Summary   Quiz   Lesson 3: Motions in the Oceans   Summary   Quiz   Lesson 4: Go with the Flow   Summary   Quiz   Research Report: Floods   Lesson 5: Water Please!   National Geographic: Desalination   Summary   Quiz   Chapter 8: Links Chapter 9: Earth's Weather   Lesson 6: Air, Wind, and the Atmosphere   National Geographic: Endangered: Earth's Ozone Layer   Summary   Quiz   Research Report: Weather   Lesson 7: Weather and Climate   National Geographic: Watch Out for Wild Weather!   Summary   Quiz   Chapter 9: Links