801595
| Question | Answer |
| What is abrasion? | Pieces of material are carried in the water and wear away the bank like sandpaper |
| What is attrition? | Material carried along the river collides into other pieces of material and breaks into smaller pieces |
| What is hydraulic action? | The force of water hitting the river bank/ bed which then breaks pieces off |
| What is solution erosion? | Some rocks (like limestone) are dissolved by acids in the water, which then go on to corrode the river bank/ bed |
| Name 4 types of erosion. | Abrasion, attrition, hydraulic action and solution erosion |
| Name 4 types of transportation. | Traction, saltation, solution and suspension |
| Define erosion. | The removal of material |
| Define transportation. | The movement of the load along the river channel |
| Define traction. | Large boulders and rocks are rolled along the river bed by the rising power |
| Define saltation. | Sand sized particles are bounced along the river bed |
| Define suspension. | Small particles are carried along by the river |
| Define solution (transportation). | Material is dissolved into the river and then transported |
| Define deposition. | Material is dumped at a point along the river after being carried from further upstream |
| What is the difference between lateral and vertical erosion? | Lateral erosion- wearing away the river banks, widening the channel Vertical erosion- wearing away the river bed, making the channel deeper |
| Describe the cross profile and river channel in the upper course of a river. | Cross profile- steep 'v' shaped valley. Tall narrow cross profile. River channel- Narrow channel, shallow water |
| Describe the cross profile and river channel in the middle course of the river. | Cross profile- profile widens, less deep and the valley sides are less steep. River channel- becomes wider and deeper |
| Describe the cross profile and river channel in the lower course of a river. | Cross profile- the valley is very broad. The sides are a long way from the river. The valley is gently sloping and low lying River channel- deepest and widest part of the river |
| How does the gradient of a river change as you move from the source to the mouth? | The gradient becomes much less steep |
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