Chalk can be made by stirring together calcium carbonate and clay, or it can be manufactured by molding. Chalk is made mostly of limestone or gypsum.Continue Reading
Extruded chalk is made by stirring calcium carbonate, color pigment, clay and a binding agent to form a doughy material, which is then pressed into cylindrical shapes and cut into sticks of chalk. This type of chalk is dustless, meaning that the dust doesn't travel through the air. It is typically used as blackboard chalk.
Molded chalk is not dustless and is made by mixing dry pigment, water and plaster. The chalk is then molded into sticks and kiln-dried.
Chalk is formed naturally from limestone, a sedimentary rock that is made of calcium carbonate. It also forms from gypsum, a mineral known as calcium sulfate that is formed from the residue of evaporated water.Learn more about Toys
The reaction between chalk and vinegar is a neutralization reaction between calcium carbonate and acetic acid to produce water, carbon dioxide and calcium acetate. Carbon dioxide is a gas that causes the reaction to bubble.Full Answer >
According to Discovering Fossils, chalk occurs naturally in nature as calcium carbonate, a form of limestone. Limestone is formed from the decomposition and sedimentation of Coccolithophores skeletons, a type of plankton.Full Answer >
Great Britain has a variety of geological natural resources, including coal, natural gas, petroleum, limestone, chalk, salt, iron ore, slate, clay, zinc, tin, silver, gold and lead. Arable land is also an important natural resource. Twenty-five percent of Great Britain's land is used for farming, and 46 percent is pasture land used for grazing livestock.Full Answer >
England's vast geological natural resources include coal, petroleum, natural gas, iron ore, lead, zinc, gold, tin, limestone, salt, clay, chalk, gypsum, potash, silica sand and slate. Agricultural resources in England include sheep, wheat, barley and arable land.Full Answer >