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6. the place where a river flows into another river is called a:
- watershed
- drainage basin
- tributary
- confluence
7. As a waterfall retreats upstream, it creates a feature called:
- a river cliff
- a interlocking sper
- gorge
- v shaped valley
8. which of these is NOT an example of erosion?
- attrition
- solution
- oxidation
- hydraulic action
9. The term "corassion" refers to:
- The erosion of material from the bed and banks of a river by the water itself.
- The process by which rivers grind their load against their bed and banks.
- The process by which rivers dissolve soluble minerals
- Material such as rocks and stones colliding with each other
10. When alluvium (silt) builds up on the banks of a river, what are formed?
- floodplains
- levees
- waterflls
- delta
11. what mostly takes place in the lower course of a river
- erosion
- deposition
- transportation
- traction
12. The term "traction" refers to the way in which materials in the river's load are bounced along the riverbed.
13. This feature is formed when a meander is abandoned by a river.
- a sper
- ox bow lake
- levee
- braiding
14. V-shaped valleys, interlocking spurs and waterfalls are usually found in which part of a river?
- lower course
- upper course
- upper middle course
- lower middle course
15. As a river begins to lose energy, material carried in suspension is deposited first and the rest of the load is carried farther.
16. The term "hydraulic action" refers to the force of the water itself, which helps to loosen material from the bed and banks of a river.