
A waterfall is a river or other body of water's steep fall over a rocky ledge into a plunge pool below. Waterfalls are also called cascades.
Often, waterfalls form as streams flow from soft rock to hard rock. This happens both laterally (as a stream flows across the earth) and vertically (as the stream drops in a waterfall). Many waterfalls in an area help geologists and hydrologists determine a region's fall line and underlying rock structure.
Waterfalls are also classified by height. Angel Falls, the world’s tallest waterfall, plummets 979 meters (3,212 feet) into a remote canyon in a rain forest in Venezuela. The water, from the Gauja River, often does not reach the bottom. The fall is so long, and so steep, that air pressure is stronger often than the water pressure of the falls. The water is turned to mist before it reaches the small tributary below.
Picture Credit : Google

The Shivanasamudra Falls is on the Kaveri River after the river has found its way through the rocks and ravines of the Deccan Plateau and drops off to form waterfalls. The island town of Shivanasamudra divides the river into twin waterfalls.
Shivanasamudra Falls is a waterfall in Chamarajanagar District of the state of Karnataka, India. It is situated along the river Kaveri, which forms here the boundary to the Mandya, and is the location of one of the first hydro-electric power stations in Asia, which was set up in 1902.The project was designed by Diwan Sheshadri Iyer.
The Gaganachukki waterfalls are best viewed from the Shivanasamudra watch tower. Most of the pictures showing the twin waterfalls are taken from that location. There is another approach to the Gaganachukki falls from the Darga Hazrath Mardane Gaib (Imam Ali). Despite warnings being posted, people climb down the rocks and attempt to view the waterfalls from behind/top, resulting in many fatal accidents. It is 139 km (86 mi) from the city of Bangalore.
Picture Credit : Google