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 Most people first encounter the word "chalk" in school where it refers to blackboard chalk, which was originally made of mineral chalk, since it readily crumbles and leaves particles that stick loosely to rough surfaces, allowing it to make writing that can be readily erased.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
Beyond the Blackboard for Emily VanCamp and Treat Williams since Everwood. The film aired on April 24, 2011 on CBS; it was the last Hallmark Hall of Fame film broadcast on that network, which cancelled the series due to low ratings. Beyond the Blackboard Beyond the Blackboard is a Hallmark Hall of Fame made-for-television drama film starring Emily VanCamp and Treat Williams. It is based on the memoir by Stacey Bess titled "Nobody Don't Love Nobody". The story takes place in 1987 and follows a young teacher and mother of two who, fresh from college, ends up teaching homeless children at a school