The type of erosion responsible for the formation of Chambal Ravines is Gully erosion.
Gully erosion occurs when water runoff concentrates into narrow channels or gullies and removes soil particles, creating deep and steep-sided ravines. Chambal Ravines, located along the Chambal River in central India, are characterized by these distinct erosional landforms.
The Chambal River and its tributaries experience significant water flow during the monsoon season, which leads to the erosion and cutting of the landscape, forming the ravines. The continuous erosion and expansion of gullies over time result in the formation of the Chambal Ravines.
Therefore, the correct answer is: Gully erosion.