the way water and wind change rocks is called weathering.
when water gets into the cracks of rocks, it can freeze and push against the rocks. the cracks get bigger and then the rocks break.
when rocks slide down a hill, they may break and become smaller. the smaller rocks then break down into sand.
when water gets into the cracks of rocks, it can freeze and push against the rocks. the cracks get bigger and then the rocks break.
when rocks slide down a hill, they may break and become smaller. the smaller rocks then break down into sand.