The type of rock formed when smaller bits of rock become pressed or cemented together is called a sedimentary rock. Sedimentary rocks are formed through the process of sedimentation, which involves the deposition and accumulation of sediments over time. These sediments can be derived from various sources, including weathered rock particles, organic matter, and chemical precipitates. As the sediments accumulate and are subjected to pressure and heat, they undergo compaction and cementation, resulting in the formation of solid sedimentary rocks. Examples of sedimentary rocks include sandstone, limestone, shale, and conglomerate.