The process most likely directly responsible for the formation of the Monahans Sandhills in west Texas is:
1. **Wind Erosion**: Over time, the constant action of wind blowing loose sand grains across the landscape can lead to the accumulation of sand dunes like the Monahans Sandhills. As the wind blows, it lifts and carries sand particles, which can impact the landforms in the area.
2. **Deposition**: As the wind transports sand grains, it eventually loses energy and deposits the sand in certain areas, creating sand dunes. In the case of the Monahans Sandhills, the deposition of sand by wind has built up the distinctive dune formations seen in the region.
3. **Sand Dune Migration**: Due to prevailing wind patterns, the sand dunes at Monahans Sandhills can slowly migrate or shift over time. This movement is a result of the continuous process of erosion and deposition, shaping and reshaping the dunes in the area.
In summary, the combination of wind erosion, deposition, and sand dune migration is most likely directly responsible for the formation of the Monahans Sandhills in west Texas.
