How Waterfalls Are Formed

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How Waterfalls Are Formed

Questions and Answers
  • 1. 
    Waterfalls are usually found in the lower course of a river.
    • A. 

      True

    • B. 

      False

  • 2. 
    The main reason a waterfall forms is because
    • A. 

      It rains a lot and therefore the water has a lot of velocity.

    • B. 

      The water cascades over a layer of hard rock and erodes a layer of soft rock underneath.

    • C. 

      The river is finding the easiest route to sea eroding through the soft rock.

    • D. 

      Erosion is greatest on the outside of the meander bend.

  • 3. 
    Which word means 'the slow wearing away of something'?
    • A. 

      Erosion

    • B. 

      Collapse

    • C. 

      Gorge

    • D. 

      Retreat

  • 4. 
    Which word means 'a narrow valley with steep walls, usually with a river or stream at the bottom'?
    • A. 

      Meander

    • B. 

      Ox-bow lake

    • C. 

      Gorge

    • D. 

      Delta

  • 5. 
    As the soft rock continues to erode, what is formed at the foot of a waterfall?
    • A. 

      Meander

    • B. 

      Delta

    • C. 

      Plunge pool

    • D. 

      Estuary

  • 6. 
    Eventually the ______ _______ at the top of the waterfall loses all of its support and falls into the plunge pool.
  • 7. 
    As this process continues, the waterfall moves further and further back up the river towards it's source. This process is called a ___________.
  • 8. 
    As the waterfall moves back up towards the source of the river a _______ is formed.
  • 9. 
    Which word means' to move backwards or withdraw'?
    • A. 

      React

    • B. 

      Retreat

    • C. 

      Reveal

    • D. 

      Respond

  • 10. 
    A process of __________ causes the layer of soft rock to gradually wear away.
  • 11. 
    As more and more of the soft rock erodes, a _______ _______ is formed at the base of the waterfall.
  • 12. 
    A waterfall will form where you find
    • A. 

      Rapids

    • B. 

      Hard and soft rock

    • C. 

      A gorge

    • D. 

      A meander

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