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 Most people first encounter the word "chalk" in school where it refers to blackboard chalk, which was originally made of mineral chalk, since it readily crumbles and leaves particles that stick loosely to rough surfaces, allowing it to make writing that can be readily erased.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? a episode titled What Are Little Girls Made Of? was released, describing the culmination of Nurse Chapel's search for her fiancée (Korby), and the discovery of his plans for conquest. The nursery rhyme's notion of the composition of girls was the inspiration behind the Cartoon Network original series "The Powerpuff Girls", in which Professor Utonium creates the Powerpuff Girls by adding together sugar, spice, and everything nice (and Chemical X by mistake). In the same show, Mojo Jojo gathers the snips and snails and a puppy-dog tail and flushes them down a toilet to create the Rowdyruff Boys. It also