Which term refers to the sloped sides of a channel?

Answer: B — Streambank

The term that refers to the sloped sides of a channel is "streambank." Streambanks are the side walls of a river or stream channel that help contain the flow of water and provide a boundary to the watercourse. They can vary significantly in material composition and stability, and they play a crucial role in the ecology of aquatic systems, providing habitat and structural integrity. In contrast, "thalweg" refers to the line connecting the lowest points in a stream or riverbed, indicating the path typically taken by the fast-flowing water. "Flood plain" describes the flat, low-lying area adjacent to the river or stream that is prone to flooding when water levels are high, while "channel" denotes the actual path through which the stream or river flows. These other terms describe different features related to waterways, but they do not specifically refer to the sloped sides of a channel.