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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.

  • false
  • true

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.

  • false
  • true

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.

  • true
  • false