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>
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>
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>
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>
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>
This is what is happening to all those rivers – going underground!
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>
Twice a year people go down Gaping Ghyll with Fell Beck
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>
The Underground Cavern <ul><li>The drop is 340 feet, straight from the surface . </li></ul>
Back out to the Surface <ul><li>Look at the strange rock formations that you can see on the cave wall </li></ul>
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>
What would we see if we followed the river underground?
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>
Can you work out how these amazing shapes form?
Write a poem or description of stalactites and stalagmites to explain how they have formed.