Where did Fell Beck go?Where did Fell Beck go?

In the Yorkshire Dales, the In the Yorkshire Dales, the rivers keep disappearing. rivers keep disappearing. What on earth happens to What on earth happens to

them?them?

This is what the area looks This is what the area looks likelike

Here are some clues Here are some clues

A Limestone A Limestone pavementpavement is the name is the name given to a large flat area given to a large flat area of bare limestone. The of bare limestone. The surface of the pavement surface of the pavement is divided into blocks, is divided into blocks, called clints, separated called clints, separated by vertical cracks, called by vertical cracks, called grikes. The best grikes. The best example of a limestone example of a limestone pavement is up on top pavement is up on top of Malham Cove.of Malham Cove.

How does a Limestone Gorge How does a Limestone Gorge form?form?

Gordale Scar is a very Gordale Scar is a very impressive 1 kilometre impressive 1 kilometre long, vertical sided long, vertical sided gorge with 70-80 gorge with 70-80 metre high cliffs. metre high cliffs.

A very small stream A very small stream Gordale Beck flows Gordale Beck flows through the gorge but through the gorge but it is obvious that a it is obvious that a stream of this size stream of this size could not possibly be could not possibly be responsible for responsible for eroding this massive eroding this massive gorge.gorge.

Does this image give you any Does this image give you any clues?clues?

All the rivers in this All the rivers in this area keep on area keep on disappearing.disappearing.

We are going to see We are going to see if we can work out if we can work out why the rivers just why the rivers just cannot stay on the cannot stay on the surface, where they surface, where they should be.should be.

I wonder if the rocks are to I wonder if the rocks are to blame?blame?

Let us look at the RocksLet us look at the Rocks

Your teacher will show you some Your teacher will show you some samples of rocks, including the rocks samples of rocks, including the rocks found in the area of Yorkshire where found in the area of Yorkshire where the rivers are all disappearingthe rivers are all disappearing

Which rock do you think is in Which rock do you think is in Yorkshire?Yorkshire?

Why are the rivers disappearing?Why are the rivers disappearing?

Shakeholes (will become Shakeholes (will become potholes)potholes)

You have to be You have to be very careful very careful walking around in walking around in the Yorkshire Dales the Yorkshire Dales because the because the ground is full of ground is full of holes like these.holes like these.

This is what is happening to all This is what is happening to all those rivers – going those rivers – going

underground!underground!

The Limestone Scenery The Limestone Scenery of the Malham Areaof the Malham Area

The landscape and The landscape and scenery in the Yorkshire scenery in the Yorkshire Dales is one of the most Dales is one of the most interesting in the UK. interesting in the UK.

The limestone rocks of The limestone rocks of the area have the area have produced towering produced towering cliffs, deep gorges, cliffs, deep gorges, impressive valleys, impressive valleys, beautiful waterfalls and beautiful waterfalls and unusual limestone unusual limestone pavement.pavement.

Twice a year people go down Twice a year people go down Gaping Ghyll with Fell BeckGaping Ghyll with Fell Beck

Let us join them -Let us join them -Going UndergroundGoing Underground

The First ChallengeThe First Challenge

Once we get Once we get underground, there underground, there are many steep are many steep drops worn away drops worn away by the water over by the water over all the yearsall the years

The Underground CavernThe Underground Cavern

The drop is The drop is 340 feet, 340 feet, straight from straight from the surfacethe surface. .

Back out to the SurfaceBack out to the Surface

Look at the strange Look at the strange rock formations rock formations that you can see that you can see on the cave wallon the cave wall

The river is back at Malham The river is back at Malham CoveCove

A stream emerges from A stream emerges from underground to flow down underground to flow down the valley. This stream the valley. This stream disappeared underground disappeared underground several miles away to flow several miles away to flow through a system of caves through a system of caves and passages along the and passages along the cracks in the limestone. cracks in the limestone. The stream flows out from The stream flows out from under the ground. This is under the ground. This is called the resurgence. called the resurgence.

What would we see if we What would we see if we followed the river followed the river

underground?underground?

Your TaskYour Task

Some people in the United Kingdom do not Some people in the United Kingdom do not know about our underground caves and rivers.know about our underground caves and rivers.

Your task is to produce a poster or leaflet to Your task is to produce a poster or leaflet to advertise this area to visitors. Include an advertise this area to visitors. Include an illustration of the underground world that is illustration of the underground world that is under our feet.under our feet.

Leave a space for a special feature to be Leave a space for a special feature to be addedadded

Can you work out how these Can you work out how these amazing shapes form?amazing shapes form?

Write a poem or description of Write a poem or description of stalactites and stalagmites to stalactites and stalagmites to

explain how they have formed.explain how they have formed.

The Beauty 0f LimestoneThe Beauty 0f Limestone