Limestone Landscapes


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This PPT created by Josie Wood at Swanmore is useful for lesson 5 of the Best of Britain sow

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Limestone Landscapes

  1. 1. Where did Fell Beck go? In the Yorkshire Dales, the rivers keep disappearing. What on earth happens to them?
  2. 3. This is what the area looks like
  3. 4. Here are some clues <ul><li>A Limestone pavement is the name given to a large flat area of bare limestone. The surface of the pavement is divided into blocks, called clints, separated by vertical cracks, called grikes. The best example of a limestone pavement is up on top of Malham Cove. </li></ul>
  4. 5. How does a Limestone Gorge form? <ul><li>Gordale Scar is a very impressive 1 kilometre long, vertical sided gorge with 70-80 metre high cliffs. </li></ul><ul><li>A very small stream Gordale Beck flows through the gorge but it is obvious that a stream of this size could not possibly be responsible for eroding this massive gorge. </li></ul>
  5. 7. Does this image give you any clues? <ul><li>All the rivers in this area keep on disappearing. </li></ul><ul><li>We are going to see if we can work out why the rivers just cannot stay on the surface, where they should be. </li></ul>
  6. 8. I wonder if the rocks are to blame?
  7. 9. Let us look at the Rocks <ul><li>Your teacher will show you some samples of rocks, including the rocks found in the area of Yorkshire where the rivers are all disappearing </li></ul><ul><li>Which rock do you think is in Yorkshire? </li></ul><ul><li>Why are the rivers disappearing? </li></ul>
  8. 10. Shakeholes (will become potholes) <ul><li>You have to be very careful walking around in the Yorkshire Dales because the ground is full of holes like these. </li></ul>
  9. 11. This is what is happening to all those rivers – going underground!
  10. 12. The Limestone Scenery of the Malham Area <ul><li>The landscape and scenery in the Yorkshire Dales is one of the most interesting in the UK. </li></ul><ul><li>The limestone rocks of the area have produced towering cliffs, deep gorges, impressive valleys, beautiful waterfalls and unusual limestone pavement. </li></ul>
  11. 13. Twice a year people go down Gaping Ghyll with Fell Beck
  12. 14. Let us join them - Going Underground
  13. 15. The First Challenge <ul><li>Once we get underground, there are many steep drops worn away by the water over all the years </li></ul>
  14. 16. The Underground Cavern <ul><li>The drop is 340 feet, straight from the surface . </li></ul>
  15. 17. Back out to the Surface <ul><li>Look at the strange rock formations that you can see on the cave wall </li></ul>
  16. 18. The river is back at Malham Cove <ul><li>A stream emerges from underground to flow down the valley. This stream disappeared underground several miles away to flow through a system of caves and passages along the cracks in the limestone. The stream flows out from under the ground. This is called the resurgence. </li></ul>
  17. 19. What would we see if we followed the river underground?
  18. 20. Your Task <ul><li>Some people in the United Kingdom do not know about our underground caves and rivers. </li></ul><ul><li>Your task is to produce a poster or leaflet to advertise this area to visitors. Include an illustration of the underground world that is under our feet. </li></ul><ul><li>Leave a space for a special feature to be added </li></ul>
  19. 21. Can you work out how these amazing shapes form?
  20. 23. Write a poem or description of stalactites and stalagmites to explain how they have formed.
  21. 24. The Beauty 0f Limestone