Which one of the following types of erosion is responsible for the formation of Chambal Ravines?

Gully erosion is responsible for the formation of Chambal Ravines. Ravines are a type of fluvial erosional feature and are formed as result of constant vertical erosion by streams and rivers flowing over semi arid and arid regions. The region through which the Chambal river flows does not receive enough rainfall to create ravines that are 60–80 m deep.