"Clastic" refers to a type of sedimentary rock that is formed from the accumulation of fragments, or clasts, of pre-existing rocks and minerals. These fragments can vary in size, ranging from tiny grains of sand to larger pebbles. Clastic rocks are classified based on the size of their particles, with common examples including sandstone, shale, and conglomerate. The process of forming clastic rocks begins with the weathering and erosion of existing rocks, which breaks them down into smaller pieces. These fragments are then transported by natural forces like water, wind, or ice, and eventually deposited in layers. Over time, the pressure from overlying materials compacts these sediments, and minerals may cement them together, creating solid rock.