give few lines on chalk
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1. A chalk line or chalk box is a tool for marking long,
2. straight lines on relatively flat surfaces, much farther than is practical by hand or with a straightedge.
3. It is an important tool in construction and carpentry, the working of timber in a rough and unplaned state, as it does not require the timber to have a straight or squared edge formed onto it beforehand.
2. straight lines on relatively flat surfaces, much farther than is practical by hand or with a straightedge.
3. It is an important tool in construction and carpentry, the working of timber in a rough and unplaned state, as it does not require the timber to have a straight or squared edge formed onto it beforehand.
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chalk is a soft,white,porous sedimentary carbonate rock,a form of limestone composed of the mineral calcite.
chalk has greater resistance to weathering and slumping than the clays with which it usually associated,thus forming tall steep cliffs where chalk ridges meet the sea.
the chemical composition of chalk is calcium corbonate,with minor amount of silt and clay.
chalk has greater resistance to weathering and slumping than the clays with which it usually associated,thus forming tall steep cliffs where chalk ridges meet the sea.
the chemical composition of chalk is calcium corbonate,with minor amount of silt and clay.
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