Final answer:
An entrenched meander features a symmetrical valley, steep sides, and a gorge-like appearance due to the river's erosive processes. Additional river system features can include cut banks, point bars, levees, oxbow lakes, thalwegs, flood plains, and terraces. Option a) is correct.
Step-by-step explanation:
The features of an entrenched meander include a symmetrical valley, where the cross-section is balanced and not tilted towards one side. Often, it possesses steep sides, giving it a gorge-like appearance due to the river vigorously cutting down into the landscape as the valley uplifts or the sea level drops. This is typically associated with an area of uplifted terrain or regions undergoing tectonic activity. Understanding these features is part of geomorphology.
An entrenched meander, unlike a canyon, is specifically a product of river activity and is indicative of the power of erosion and downcutting by a river through reinforcing mechanisms which may include hydraulic action and corrasion. These geological processes meticulously sculpt the prominent snaking patterns in the landscape that are stable over long periods.
Some other features associated with a river system may include cut bank, point bar, levee, oxbow lake, thalweg, flood plain, and terrace. These all contribute to the complexity and diversity of riverine landscapes.