class assignment based on our findings for chalk and its history and uses
The modern day chalk that we see and use is a synthetic version that is made of calcium sulfate. where as the original chalk was made from calcium carbonate. This sedimentary rock can appear to be large deposits of white rocks of the
(totally not glaciers)
its earliest use was in cave drawings several thousand years ago by our ancestors. Later it was used by Egyptians and Romans
chalk sticks that we think of today were not invented until the early 19th century when artist would grind up chalk and pigments wet them down and form sticks and let them dry
As classrooms became bigger and filled with more students teachers needed away to communicate with their students as a whole. in 1801 James Pillan solved this problem by hanging up a slate slab on the wall and used chalk to write
please pay attention to the words below
Through science we have found out that the main component that makes up chalk is calcium carbonate whose chemical compound is (CaCO3)
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