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Limestone is quarried out of the ground. This has various advantages and disadvantages:
It Creates Jobs
It Brings money to an area.
It Scars the Landscape
It Destroys Habitats
Explosives are noisy
It creates lots of dust
Transport of limestone is noisy and causes pollution
Disused Sites are dangerous
Also, what do you do with the disused quarries
Limestone has many uses:
It is useful as a building material as it can be carved and used as blocks for buildings. It is virtually
insoluble in water, however it can be dissolved by acid rain.
It can be crushed up and made into chippings for road surfacing
Powdered limestone mixed with powdered clay when heated in a kiln makes cement.
Cement can then be used to make mortar for pasting bricks, by adding sand and water, or to make
concrete by adding gravel to the mortar.
Limestone can be used to make glass by heating it with sodium carbonate and sand.
The limestone cycle is as follows
Step 1 - Thermal decomposition.
Calcium Carbonate (C.A.C.O.3.) is thermally decomposed to make calcium oxide (C.A.O) and carbon
dioxide (.C.O.2). Calcium Oxide is quicklime.
Other carbonates decompose in the same way. For example Sodium Carbonate (N.A.2.C.O.3)
decomposes to produce (N.A.2.0) and (C.O.2).
Step 2 - Add Water
C.A.O add H.2.O produces C.A.O.H.2, Calcium Hydroxide. This is also known as Slaked Lime. Slaked
Lime is an alkali, and is often used in fields to neutralise acid soils. Slaked lime dissolved in water is
Step 3 - Add C.O.2
Adding C.O.2. to slaked lime produces limestone and water. This is also the test for carbon dioxide, by
bubbling it through limewater, and should turn cloudy, (i.e. calcium carbonate is being produced) then
C.O.2. is present.

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