This lesson plan outlines an erosion experiment to be conducted by Year 4 students. The students will create three soil landscapes with different materials (dirt, dirt and bark, dirt and plants) and test how each reduces erosion when water is poured on them. By conducting this experiment, students will understand the cause and effect relationship of water erosion and identify features that make their investigation a fair test. They will draw conclusions by discussing their results and comparing with classmates to build a common understanding. The lesson aims to teach students how water impacts the environment and how to investigate ways to reduce that impact through experimentation and thinking like scientists.