The following steps describe how sedimentary rock forms at the bottom of a river. Which two steps involve erosion? 1 A large rock breaks down into sediment.
2 The water transports and deposits the sediments.
3 The water also transports calcite and clay, which glue the sediments together.
4 The upper layers of deposits put pressure on the lower layers.
5 Rock forms as the layers of sediment and glue compact and cement together.