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Limestone and Chalk Features
The White Cliffs of Dover are an example of a chalk and limestone landscape.

Limestone and Chalk Features

In GCSE Geography students will look at the some of the different types of rock, and how to classify them. This quiz looks at some of the uses of limestone and chalk and also some limestone and chalk features found in the landscape, such as caves or cliffs.

The features of every landscape are shaped by its underlying geology. The Yorkshire Dales, the Chalk Downs and the White Cliffs of Dover - each of these is a famous British landscape that is entirely shaped by an underlying geology of chalk or limestone.

Limestone is composed of the skeletal remains of marine creatures that died millions of years ago. The bodies of dead corals, molluscs and other animals have built up on the sea floor over time into layers that can be hundreds of metres deep. Sometimes entire reefs can be preserved as a window into the past.

Marble has the same chemical composition as limestone but is a different type of rock. Which type of rock is marble?
Marble is created after limestone has been subjected to heat and pressure
Stalactites are composed of layers of calcium carbonate. Why are stalactites more common in limestone regions?
The water is alkaline and so doesn't dissolve the limestone
Limestone regions are the only place that contain caves. Caves have the damp atmosphere that is crucial for stalactite formation
As the water runs through the limestone it picks up imperfections such as sand and deposits these in the form of limestone
As water runs through limestone it dissolves the limestone and deposits this as it drips off the roof of caves in the limestone
Stalactites are layers of dissolved limestone, or other types of calcium carbonate. As the water runs down the formation it leaves behind some of that dissolved limestone
Fossils are frequently found in limestone. What sort of rock is limestone?
Fossils are the remains of formerly living creatures, but the heat and pressure of metamorphic and igneous processes destroy them. Remember that fossils are found in sedimentary rocks as this is a frequent exam question
Why are limestone products sometimes added to soil?
As a plant food
To help increase the drainage
To prevent attack by snails and slugs
To neutralise or increase the pH
Powdered limestone is often used to neutralise acids in the soil or water. This can be because the soil is naturally acidic, or acidic due to pollution
Why do underground rivers commonly form in limestone regions?
There are natural caverns in the limestone when it forms
Limestone can be dissolved by acid water, allowing it to flow down and through fissures and cracks
As the rocks swirl they create pot holes which widen to form caverns
Because limestone is one of the oldest types of rock, water has had millions of years to work its way through it
Limestone is relatively easily dissolved, especially by water with a low pH. This is why acid rain is so damaging to limestone statues and buildings
Since limestone is mostly composed of the remains of marine organisms, what does that tell us about the landscape these rocks were originally formed in?
The limestone formed underwater before geological pressures and sea level change brought it up to form dry land
The marine creatures were brought up on to land by some geological action and then formed the limestone layers
Originally the landscape must have been warm and dry to prevent the rain washing away the remains of these creatures
The rock hasn't moved very far since the layers of limestone formed these rocks
Limestone reefs often contain the remains of full heads of coral and other marine creatures. Over millions of years the land has been uplifted out of the sea
Limestone is frequently quarried for a variety of uses, often in national parks and areas of outstanding natural beauty. Which of the following is a disadvantage of quarrying?
Jobs are created for the local population
The raw material limestone is available for a variety of uses
Quarries cause an increase in traffic on often rural roads
The former quarries are often used as nature reserves and sports facilities
Quarries will often lead to an increase in noise and air pollution in rural areas - often in national parks and areas of outstanding natrual beauty. The other three options were all advantages rather than disadvantages
The White Cliffs of Dover are a chalk landscape. Why are these cliffs straight and relatively slow to erode rather than sloped and rapidly eroding?
They are a soft rock, which means their base is rapidly eroded and collapses
They are a hard rock, so the main way they are eroded is by wave action undercutting them until their unsupported weight collapses
The bedding plains in the cliff are vertical, making it easy to collapse in vertical sections
The calcium carbonate is easily eroded and so the water washes the rock away. Rain and wave spray remove the cliffs rapidly
Chalk is a hard rock, meaning that it resists erosion. The powerful action of the waves at the bottom of the cliff will be the main source of erosion, causing the cliffs to have a steep straight profile. Remember that soft cliffs will have a lower profile
What is the chemical composition of limestone?
Calcium oxide CaCO
Silica dioxide SiO2
Calcium carbonate CaCO3
Dihydro monoxide H2O
Limestone is calcium carbonate. This key part of concrete, glass making and other products is the same stuff that you study in science
Which of the following is an example of limestone?
Kentish ragstone
Cheshire sandstone
Shap granite
Italian marble
This sort of question may crop up in the exam. Whilst you're not expected to know that Kentish ragstone is a type of limestone you are expected to know that sandstone, granite and marble are not limestone, even though marble and limestone share the same chemical formula
Author:  Ruth M

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