The Dynamics of a Waterfall
A Waterfall is a geological landform where a River or stream flows over a vertical drop or a series of steep drops in the course of its flow. This phenomenon is a central study in Hydrology and Geomorphology. According to National Geographic, the formation typically occurs when a stream flows from hard rock to soft rock. This leads to the differential Erosion of the softer layer, creating a steep ledge. Over time, the Waterfall may recede upstream, carving a deep Gorge into the landscape.
Waterfalls are categorized by their physical characteristics and the volume of water they displace. Angel-Falls in Venezuela is the world's tallest uninterrupted drop, while Victoria-Falls on the Zambezi-River is one of the most expansive sheets of falling water on Earth. Beyond their aesthetic and ecological value, these features are often harnessed for Tourism and the production of Hydroelectric-Power. Further scientific details on the classification and lifecycle of these aquatic features can be found at Britannica.