Geology Sedimentary Rocks Research Sedimentary rocks are rocks formed from other rocks, usually fine particles compressed and cemented together overtime. This involving the compaction of particles and the cementation of sediments. Research Exercise - Sedimentary Rocks Visit the library or gain internet access to answer the following questions. Put your answers in the spaces provided. 1. Why mudflats are made from very fine particles? . Why is there layering in sedimentary limestone rocks? 3. How can sediments be sorted? Describe two properties that are important to sort sediments. 4. Non-clastic rocks help classify sedimentary rocks. What do we mean by: Chemically derived non-clastic rocks: Organically derived non-clastic rocks: 5. What are clastic rocks and how are they formed?