three stages of a river

• A, upper course: V shaped valley, small in volume, steep slope, deep gorges, narrow floor
• B, middle course: becomes wider and larger, has tributaries, wide floored valley with gentle sloping sides,bigins to meander
• lower course: flows fast meandering over wide plains and makes wide spread deposition
• features of the lower course: flat flood plains, big meander, levees, oxbow lake, deltas