Final answer:
A depositional feature built on the inside of a stream channel curve due to lower velocity is called a point bar. It forms from the deposition of sediment where the river meanders and slows down, usually on the inside curve of a bend.
Step-by-step explanation:
A depositional feature that has been built on the inside of a stream channel curve because of lower velocity is a point bar. This feature forms when streams or rivers meander, indicating the tendency to scour the outer bend of a river channel and deposit sediment on the inner bend. As the river flows and meanders, sediment is deposited where the water velocity decreases, often on the inside curve of a bend, creating a point bar. This is due to the lower energy present on the inner curve which cannot carry as much sediment. Thus, water on the outer curve, with higher velocity, erodes the bank known as a cut bank, while the slower moving water on the inner curve results in a build-up of sediment, forming the point bar.