If You Journeyed to the Headwaters of the Rio Grande

Multiple Choice

If you journeyed to the headwaters of the Rio Grande River in New Mexico, you would find that the material in the channel consists of large cobbles and boulders. However, if you then traveled to the mouth of the river as it enters the Gulf of Mexico, you would find that the channel bed material is composed of sand and silt. The process responsible for this type of change in sediment size is

A) solution.
B) abrasion.
C) hydraulic action.
D) suspension.