Students observe the processes of erosion and deposition by modeling rain falling on a hillside. They time the speed of running water on the model hillside, relate the steepness of a slope to the amount of erosion, and observe that when running water slows down, it deposits sediments.

Student Resources

• 8.1 Vocabulary
• 8.2 Erosion and Slope
• 8.3 Section 8 Assessment

Learn by Reading

For additional content-area reading, check out the Houghton Mifflin Science eBook: Grade 4, Unit C, pages 28–29.