Some Characteristics of Sedimentary Rocks:
Lithification is when the sediments are transformed into rocks.
Clastic sedimentary rocks are the products of mechanical breakup of other rocks (e.g. conglomerate, sandstone, and shale).
Chemical sedimentary rocks are not from mechanical but forms via chemical precipitation or growth from solution (e.g. limestone).
Organic sediments consists of carbon rich remains of once living organism (e.g. coal).