Erosion and weathering shape rocks. Weathering causes erosion, meaning that wind and water wear down rocks and soil. Water is the primary agent of this. Water can run over a rock in a creek to make it smooth. Water can also break chunks of rock off of cliffs, mountains, and other natural stone structures, resulting in rocks with jagged edges from being broken off its base. Over time, water and wind can break a rock down into sand, and they can also move the rock away from its original position, causing further erosion and change to its shape.
Erosion and weathering do change the shape of rocks, however so does human interaction. We change the path of rivers, streams even areas of the oceans. This in turn changes the chemistry of some geomorphing thus changing the shape of rocks.
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