In the upper course, the river channel is narrow and steep as it cuts downwards through the landscape. In the middle course, the river widens and deepens its channel through lateral erosion, forming meander loops that can become cut off to create oxbow lakes. In the lower course, the river slows and widens its floodplain, where deposition builds up rich alluvial soil and landforms like natural levees and deltas can form at the river's mouth.

4. The river cuts downwards like a saw. This happens in the upper part of the river and makes the valley go deep. Rain erodes the edges to make it wider at the top. Vertical erosion is dominant

5. 03/06/09 By Mohammad yaseen Serry and Mohammad Osama Hassanally

8. 03/06/09 By Mohammad yaseen Serry and Mohammad Osama Hassanally

11. 03/06/09 By Mohammad yaseen Serry and Mohammad Osama Hassanally

13. Large particles such as gravel and coarse sand are lifted and dropped along the river, so they bounce along the river bed in a series of bed. Larger particles like pebbles and boulders roll and slide along the river bed. Smaller particles such as clay, silt and fine sand are carried along without contact with the river bed. Dissolved materials containing minerals like calcium and sodium are carried in the water Solution