UPSC NDA 2 2021 General Ability Solved Paper

Pothole is the result of erosion and deposition work of a river. Pothole is a cylindrical, bowl-shaped, or irregular hollow that is usually deeper than wide. It is formed in the rocky bed of a stream by either the grinding action of sediment whirled around by stream eddies or the force of fast flowing water. Potholes usually have spirally grooved surfaces.