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Stack Formation
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Stack Formation

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  • 1. Would you associated the following with headland or bays? Calm conditions Destructive waves Constructive waves Low energy conditions Shallow water High energy conditions Exposed location Sheltered location
  • 2. http://www.flickr.com/photos/rosedavies/534844636/
  • 3. This is a chalk headland . Because chalk is a sedimentary rock , lines of weakness run throughout the headland . Hydraulic action will exploit these weaknesses.
  • 4. Between low and high tide, waves will attack the base of the headland . HT LT The process of corrasion will undercut the base of the cliff , forming a wave cut notch .
  • 5. The undercutting by corrasion will make the cliff unstable. HT LT This creates small caves which are enlarged over time by erosion.
  • 6. Caves develop on either side of the headland . HT LT These caves erode back through the headland and meet, forming an arch .
  • 7. Continued erosion at the base of the arch will cause the roof to become unstable. HT LT It may collapse leaving a stack .
  • 8. Continued erosion of the base of the stack may lead to its collapse, resulting in a stump . HT LT
  • 9.