Here's why:
* Clastic refers to fragments of pre-existing rocks. These fragments are called clasts.
* Sedimentary refers to rocks formed from the accumulation and cementation of sediments.
Water, wind, and ice are all agents of erosion that break down existing rocks into smaller pieces (clasts). These clasts are then transported and deposited, eventually forming layers that are compacted and cemented together to create clastic sedimentary rocks.
Examples of clastic sedimentary rocks include:
* Conglomerate: Made up of rounded, gravel-sized clasts.
* Breccia: Made up of angular, gravel-sized clasts.
* Sandstone: Made up of sand-sized clasts.
* Siltstone: Made up of silt-sized clasts.
* Shale: Made up of clay-sized clasts.
