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.

weathering - colorado river carves land in arizona to form the grand canyon. cracks form in a sandstone wall surrounding a house. a marble statue near the science museum is changing color due to rainfall

erosion - after a rainstorm, soil and rock piees litter the roadways. the sand dunes in the sahara desert are changing shape.

here's your answer.

only about ten percent of the energy at one trophic level is passed on to organisms at the next trophic level. the remainder of the energy is used in life processes or lost as heat.