[[1]] takes place when the running water cuts deep ravines in the absence of vegetation.

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Detailed Solution

Gully erosion takes place when the running water cuts the deep canyons without vegetation.
Gully erosion happens when water is diverted across unprotected land and washes the soil along the seepage lines. Running water carves down deep valleys and channels through the clayey soils. Such areas are known as ravines in the Chambal basin. Under normal circumstances, overflow is directed by vegetation, which for the most part, keeps the soil intact, safeguarding it from unnecessary spillover and direct precipitation. Vegetation clearing, improper land use, and compaction of the dirt brought about by brushing imply the soil is allowed to be uncovered and unfit to retain abundant water. Surface spillover then increments and moves in seepage lines, permitting soil erosion.

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