newspaper headlines. Narrow V-shaped valley Erosional Floodplain A. Site of erosion Site of deposition . Floodplain well developed C. 1. When referencing the diagram above, what are some of the attributes that make up a young stream? 2. When referencing the diagram above, what are some of the attributes that make up a mature stream? 3. When referencing the diagram above, what are some of the attributes that make up an old age stream?