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