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Chalk
By Dylan Peace
Chemical Name: Calcium Carbonate Chemical Formula: CaCO3
Calcium Carbonate is made up of little dead marine animals. It is found in the earth's crust formed in thick deposites around marine or fomer marine areas. The other types of natural chalk are black and red chalk. Chalk in its natural state was used by early men in prehistoric times for cave paintings. Its was not until the 1800's when chalk became used in classrooms. Chalk became very popular in the ninteenth century when class sizes got larger and the teachers needed to convey information to more students at once. During these times the kids used there own chalkboards so they did not waste paper since it was valuable back then.
History of Chalk:
Blackboard Draw on sidewalks In agriculture to raise pH in soils Gymnastics, rock climbing, weight lifting, tug of war: Is applied to hands for better grip and to keep them dry Toothpaste contails small amounts Pool stick Make lines on sporting fields Construction
Uses of Chalk:
Chalk is also found in limestone quarries. In the United States 95% of limestone is quarried. After this the chalk goes to the ball mills where it is grinded down very fine. Gypsum is also like limestone but this is used for colored chalk and has to be dehydrated to form chalk. The most popular place where chalk is found is in The Strait of Dover. This seperates England from France and the European continent, and connects the English Channel and Atlantic Ocean with the North Sea.
How Chalk Is Made/ Where Its Found:
Chalk dust can cause Asthma attacks Once in the atmosphere it can go into equipment (any electronic device) and stay there and it can go into your lungs Cannot do much physical harm because its calcium and that’s okay for the body
Dangers of Chalk:
Referneces
en.wikipedia.org/wiki/Chalk http://www.enotes.com/how-products-encyclopedia/chalk http://www.geologyshop.co.uk/chalk.htm http://www.erowid.org/ask/ask.php?ID=157 http://www.troydryerase.com/Chalk-Dust-Healthresearch.htm http://www.isrl.illinois.edu/~chip/projects/timeline/1800keys.html
