2006-06-08 11:09:35 · 3 answers · asked by pinky 3 in Home & Garden ➔ Other - Home & Garden
Natural chalk is a soft, white, porous form of limestone composed of the mineral calcite. It is also a sedimentary rock.
Blackboard chalk is a substance used for drawing on rough surfaces, as it readily crumbles leaving particles that stick loosely to these surfaces. Blackboard chalk, often supplied in sticks about 5 cm long, is currently made from the mineral gypsum (calcium sulfate) rather than calcium carbonate. Similarly, the "chalk" used by tailors is usually made from talc (magnesium silicate).
2006-06-08 11:17:09 · answer #1 · answered by BearDown 6 · 3⤊ 0⤋
Soylent Green...
2006-06-08 18:22:09 · answer #2 · answered by Kiowa1 5 · 0⤊ 0⤋
chalk.
2006-06-08 18:15:10 · answer #3 · answered by Anonymous · 0⤊ 0⤋
animal lard
2006-06-08 18:12:44 · answer #4 · answered by Anonymous · 0⤊ 0⤋