The correct answer is option 4 - Gully. Gully erosion refers to the process in which water erodes and cuts deep channels in the soil, forming narrow ravines or gullies. Chambal Ravines are a result of this type of erosion.
In gully erosion, water flow accumulates in an area, usually caused by heavy rainfall or improper land management practices. As the water gains velocity and volume, it starts to remove soil particles and create channels. Over time, these channels deepen and widen, forming gullies or ravines.
This process is different from other types of erosion mentioned in the options. Splash erosion refers to the movement of soil particles caused by the impact of rainfall droplets. Sheet erosion occurs when the soil surface is uniformly removed by water runoff. Rill erosion involves the development of small, concentrated channels in the soil.
It`s important to note that the formation of Chambal Ravines is primarily due to gully erosion.