weathering - the process of breaking down rocks of earths surface, erosion - the process of moving sediments from one place to another, limestone - a hard sedimentary rock ,composed mostly of calcium carbonate, sandstone - a sedimentary rock made of sand grains held together by natural cement, cementation - the process of loose sediments being glued together and hardened by minerals, compaction - the process though which layers of sediment are squeezed together by the weight of sediment above, removing water or air from spaces between particles of sediment,

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