Chalk has a wide variety of uses in the construction industry.
Calcium carbonate or chalk is a compound in the chemical field whose formula is CaCo3 and is found as rock in most parts of the world.
Chalk is formed from minute planktonic green algae that lived floating in the ocean.
After algae died, it sank to the bottom of the seas and oceans and combined with the remainder of other creatures to form the chalk we see today as rocks.
The color of chalk is always white and this is because it is formed from the remainder of colorless planktons at the bottom of the oceans. It also has an edible form which is prescribed by doctors for people lacking calcium carbonate in their bodies.
Here we talk about the structural and accessory use of chalk in building construction.
There are variant uses for chalk in building constructions such as using it as a raw material in cementing, it can also be used to control soil acidity levels.
Another use of chalk is to neutralize the level of acidity in gasses produced in power plants.
Though it is considered a strong material, the structure of chalk is also porous which makes it so suitable to be used in construction when a good level of drainage is meant.
So we can say calcium carbonate or chalk has an oceanic, plankton composed structure and is used in different fields of construction.
Chalk Composition
Chalk mostly has the composition of calcium carbonate and is classified as a sedimentary porous rock.
Also, it is formed from limestone which is composed of calcite and is mostly found at the bottom of oceans.
The process of compression of microscopic planktons at the bottom of the ocean together with other remainders from other creatures forms the rocks and cliffs we see today from chalk.
It is found in two forms soft and hard and is usually with high porosity. the white color it has is because of its colorless planktonic structure.
It is found in the form of rocks or cliffs all around the world.
Around 99 to 65 million years ago chalk was formed in the cretaceous era.
Chalk is an earthy and light form of limestone and is made of skeletons of planktons like foraminifera or coccolithophores.
It could be mined from chalk deposits on or underground and has calcium carbonate in its structure.
Besides, it is categorized as sedimentary porous rocks.
Properties of Chalk
Different types of stones have various properties that are exclusively specialized for that stone.
Chalk, as a sedimentary stone also has specialized properties that are as follows: Chalk is classified as a fairly sedimentary rock and its manmade or natural form is considered fairly soft. The color is mostly white or fairly grey.
The process of accumulation of calcite plates under the sea or ocean bottom together with small plankton skeletons under too much pressure during millions of years forms the chalk.
Since the structure is highly porous, it can hold water in it for a long time, Therefore, it is a good option for areas where there is a long time of draught.
It can be used as a natural reservoir to release water slowly for human or agricultural use.
Where Is Chalk Found
Chalk is found in almost all areas around the world but major areas range from western Europe to the southern part of Sweden and also England.
Also, it is found in some parts of the United States from Alabama to South Dakota and Texas.
It is also formed in other parts of the world with deep water areas in which, the sedimentation of calcite together with other solutions in water forms the chalk cliffs and could be found under or above sea level.
The quality of the chalk formed in these areas largely depends on how it is formed during longtime periods and how it is extracted or processed.
Totally wherever around the world where there is the sedimentation of microscopic planktons under sea or ocean, rocks or cliffs of chalk could be found.
Uses of Chalk
Chalk has a wide variety of uses both in industry and in the daily life of people.
In industry, one wide-range usage is in the polishing of metals. The other usage in the industry is pavement drawing to draw sidewalks or streets or etc.
In agriculture chalk is used to rise the level of PH in soil with high acidity which could be in the forms of CaCo3 or Cao.
In daily life, it could be used on blackboards in different colors for writing or to cover rough surfaces of walls in homes.
Also, it is used in toothpaste mildly to make it more abrasive. In sports, chalk is widely used to reduce perspiration or slippage of hands.
Builders use chalk in their putty as a filler which would be essentially flaxseed oil. so we could say chalk is widely used in industry and daily life as an essential material. 
Calcium carbonate(chalk) as a stone today is used in massive areas of life ranging from wall paintings to stationery items.
Also, it is widely used in industry and since it is a sedimentary granulated stone, it is found in two shapes soft and hard, each with several areas of usage.
This finely grained material can be found in different areas around the world ranging from western Europe to southern Sweden to England and US.
It is formed under deep water of the ocean resulting from the compression of a planktonic skeleton with calcite.
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