Students see how sedimentary rocks are made and learn the three main classifications of sedimentary rock: clastic, chemical and organic. Samples of sediment, divided by classification, are mounted to the chart. The lithification process, how sediment is made into solid rock, is described with the “finished” sedimentary rock sample shown. A total of 21 rock samples are provided. Chart is 61 × 46 cm and has a wooden frame for durability.