erosion - the carrying way of rocks, weathering - the breaking apart of rocks, canyons - flat areas surround by mountains and steep sides, mudslide - mud that slides down a mountain because of too much rain, sinkholes - holes in the ground that are formed when soil and rocks are removed by flowing water, glaciers - a thick sheet of ice that moves slowly across the land, formation - a large rock that stands out in an interesting way, sediment - very small pieces of rock (sand, gravel, dust), levees - walls to help protect against flooding, landforms - land features on Earth's surface,

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