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 Most people first encounter the word "chalk" in school where it refers to blackboard chalk, which was originally made of mineral chalk, since it readily crumbles and leaves particles that stick loosely to rough surfaces, allowing it to make writing that can be readily erased.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
Gordon Chalk Mansfield swore in Chalk as Premier on 1 August, pending the Country Party electing a new leader. They chose Joh Bjelke-Petersen, who succeeded Chalk after a week in office. Chalk continued as Treasurer and Leader of the Liberal Party until his resignation from parliament in 1976. In the Queen's Birthday Honours of June 1971, he was made a Knight Commander of the Order of the British Empire (KBE). Upon his death in 1991 Chalk was accorded a State funeral which was held at Albert Street Uniting Church and he was later cremated. Gordon Chalk Sir Gordon William Wesley Chalk, (16