How sedimentary rocks is formed a in coastal areas

The coastal area formation process is a long-run one. It is shown in the diagrams, from which is understandable how many factors are involved in. First of all, a key role is played by mountains whose rocks will turn to be coast's principal elements. Due to weather conditions, such as storms and rains, they are carried on until they reach the sea. At this point, the sedimental process starts. As it's depicted in the first diagram, the detachment of rocks is caused by the impact of rains, a phenomenon called erosion. After that, what previously belongs to the mountains reach the sea, being transported by rivers whose water take even more pieces of terrain. Finally, they reach the seaside all mixed and become part of the coast, since they let down on previously formed coastal layers. Clearly, it's a long process in which many efforts are put in and that depends on many elements, from mountain to water