Question of limestone

50 %
50 %
Information about Question of limestone
Entertainment

Published on December 6, 2007

Author: miloung

Source: authorstream.com

Slide1:  ‘A Question of’ …Nine Number Picture Boards This nine number picture board is adapted from a template available from www.sln.org.uk/geography Click a number to link to an image Click the image to link to an information page Click the yellow square to link back to the image Click the red square to link back to the picture board Once selected, numbers will change colour Slide2:  A Question of Limestone 1 3 2 4 5 6 7 8 9 Slide3:  1 What is this feature and how was it formed? How does it become this? Slide4:  2 Why is there no sign of the river which eroded this valley? Slide5:  3 What map evidence suggests the area is underlain by limestone? Image produced from the OS Get-a-Map service. Image reproduced with kind permission of the OS and OS of Northern Ireland Slide6:  4 This is the largest known example in the UK. What is it and how was it formed? Slide7:  5 This is the top of Britain’s highest waterfall. Why is it seen by very few people? Slide8:  6 What features of the structure of carboniferous limestone are visible in this photo? Slide9:  7 Why is the only limestone visible in this photograph underneath the big boulder? Slide10:  8 What is happening here? Check out photo 5. Slide11:  9 What are these shallow circular depressions? Slide12:  This is limestone pavement. After glaciers had scoured the rock, it was exposed to chemical weathering by mildly acidic rainwater. This enlarged the joints in the rock to form grykes. The blocks of rock between the grykes are called clints. Where rainwater has lain in pools on the clints, there are solution hollows and where rainwater has flowed off the clints, there are channels called runnels. After prolonged weathering, the pavement will erode until it resembles the second photo on Slide 1. clint gryke runnel Solution hollows Slide13:  This is a dry valley. Although it has a ‘V’ shaped cross section and was clearly eroded by water, there is no river flowing in it at present. At the end of the Ice Age when ice blocked all the underground passages in the rock, the limestone became temporarily impermeable. Meltwater had to flow over the surface and carved valleys such as Watlowes in the photo. After the ground thawed, water was able to make its way underground again and the valley was left dry. Slide14:  limestone pavement intermittent drainage gorge swallow hole Slide15:  This is Britain’s largest stalactite : the so-called Sword of Damocles in Ingleborough show cave. Stalactites form in underground caves where water rich in dissolved calcium carbonate drips from joints intersecting the cavern roof. Evaporation of the water results in the deposition of a tiny amount of calcite. This process, repeated over a very long time, produces a stalactite. Slide16:  When Fell Beck disappears underground at this swallow hole which is known as Gaping Gill, it plunges for over 100 metres into an underground cavern. Fell Beck rises on the impermeable Yoredale rocks of Ingleborough Hill. It flows downhill until it meets Carboniferous Limestone. At this point it disappears underground via the swallow hole of Gaping Gill. Once underground, it makes its way through the permeable limestone until it reappears beside Ingleborough cave on the impermeable rocks of the valley floor. Slide17:  joint joint joint bedding plane bedding plane bedding plane Limestone has cracks which run horizontally (bedding planes) and cracks which run vertically (joints). The bedding planes represent periods of interruption in the deposition of the rock. The joints formed when crustal movements placed the rock under stress. Slide18:  The large boulder is an erratic which was deposited on top of the limestone pavement by a glacier during the Ice Age. It has protected the limestone underneath and prevented it from weathering. All around, where the limestone has not been protected, chemical weathering has lowered the surface of the pavement. The height of the plinth of limestone beneath the erratic represents the amount of weathering which has occurred since the last ice Age. Slide19:  On the May Bank Holiday, the Bradford Pothole Club sets up a winch at the top of Gaping Gill. Members of the public can be lowered free of charge deep underground into a huge chamber the size of York Minster. It is an awesome experience. P.S. It costs £8 to be winched back to the surface! Slide20:  These little ‘craters’ are shake holes and they are commonly found in limestone country. They form when percolating rainwater enlarges joints beneath the surface. Surface deposits (often boulder clay) fall into the enlarged joints creating depressions which may range in size from 2m to 15 m across.

Add a comment

Related presentations

Related pages

PowerPoint Presentation - Staffordshire Learning Net - Home

A Question of Limestone 1 3 2 4 5 6 7 8 9 1 What ... it makes its way through the permeable limestone until it reappears beside Ingleborough cave on ...
Read more

Limestone - Wikipedia, the free encyclopedia

Limestone is a sedimentary rock composed largely of the minerals ... His efforts deal with the question of whether or not the grains were originally in ...
Read more

Questions on Limestone? | Yahoo Answers

Best Answer: 1. calcium carbonate 2.sedimentary 3 limestone is formed from dead animals and sediment being forced together by pressure. 4 ...
Read more

Frequently Asked Questions - My Limestone

each question should link to the proper question on the page and the back to top after each question should return the user to the top...
Read more

10 questions about limestone starter by Chemistry_teacher ...

A starter that can be used as revision of a topic on limestone. Contains 10 questions - students choose the right answer from a list of keywords.
Read more

Search Results for limestone - All Grades

Search Results for limestone - All Grades. 76 questions match "limestone". Refine Your Search Select questions to add to ...
Read more

Frequently Asked Questions | Limestone College

Q: Who can come to Limestone College’s Homecoming? A: All alumni, guests, students, football fans, and friends are welcome at every Homecoming. Q ...
Read more

Frequently Asked Questions - FAQ | Limestone College

Frequently Asked Questions What is Alumni Day? Every April, as spring hits the campus, the academic year nears conclusion, and the students get ...
Read more

In Praise of Limestone - Wikipedia, the free encyclopedia

"In Praise of Limestone" is a poem written by W. H. Auden in Italy ... "Limestone" questions the valuation of that which exists on a scale different from ...
Read more

Limestone Features Quiz - Geo for CXC

Limestone Features Quiz. Ensure that you have accessed the “limestone features” page to ensure that you are adequately prepared for this quiz.
Read more