Chalk produce, and thus widely used in the developing world, calcium-based chalk can be made where the crumbling particles are larger and thus produce less dust, and is marketed as "dustless chalk". Colored chalks, pastel chalks, and sidewalk chalk (shaped into larger sticks and often colored), used to draw on sidewalks, streets, and driveways, are primarily made of gypsum. Chalk is a source of quicklime by thermal decomposition, or slaked lime following quenching of quicklime with water. In southeast England, deneholes are a notable example of ancient chalk pits. Such bell pits may also mark the sites of ancient flint mines,
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