Chalk It is formed in the sea by sub-microscopic plankton, which fall to the sea floor and are then consolidated and compressed during diagenesis into chalk rock. Most people first encounter the word "chalk" in school where it refers to blackboard chalk, which was originally made of mineral chalk, since it readily crumbles and leaves particles that stick loosely to rough surfaces, allowing it to make writing that can be readily erased. Blackboard chalk manufacture now may utilize mineral chalk, other mineral sources of calcium carbonate, or the mineral gypsum (calcium sulfate). While gypsum-based blackboard chalk is the lowest cost to
What Are Little Boys Made Of? many variant forms. For example, other versions may describe boys as being made of "snaps", "frogs", "snakes", or "slugs", rather than "snips" as above. In the earliest known versions, the first ingredient for boys is either "snips" or "snigs", the latter being a Cumbrian dialect word for a small eel. The rhyme sometimes appears as part of a larger work called "What Folks Are Made Of" or "What All the World Is Made Of". Other stanzas describe what babies, young men, young women, sailors, soldiers, nurses, fathers, mothers, old men, old women, and all folks are made of. According to