Return to Unit List Grade 4 Lesson Review   Type your name:   Earth's surface is affected by many types of waveslandslidesmudflowssoilerosionSelect your answer. Pounding waveswaterlandslidesmudflowsSelect your answer grind rocks and shells into sand. Gravity can cause landslideserosionmudflowswavesSelect your answer, which occur when rocks are shaken free by heavy rain or earthquakes. After a heavy rain, when the soil is soaked, erosionwaveslandslidesmudflowsSelect your answer can result. Running landslidessoilwatermudflowsSelect your answer causes the greatest changes to Earth. The flow of rainwater picks up particles of valleywaterlandslidesrocksSelect your answer and watersoilvalleysurfaceSelect your answer. These particles can cut a rocksvalleylandslidessurfaceSelect your answer in the bedrock. The particles picked up by running water are eventually placed far from the original location changing Earth's rocksvalleywatersurfaceSelect your answer.