CHALK

Chalk

Chalk is a soft, white, porous sedimentary rock, a form of limestone composed of the mineral calcite. Calcite is calcium carbonate or CaCO3. It forms under reasonably deep marine conditions from the gradual accumulation of minute calcite plates shed from micro-organisms called coccolithophores. It is common to find chert or flint nodules embedded in chalk. Chalk can also refer to other compounds including magnesium silicate and calcium sulfate.

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chalk

Noun

  1. A soft, white, powdery limestone.
  2. A piece of chalk, or, more often, processed compressed chalk, that is used for drawing and for writing on a blackboard.
  3. Tailor's chalk.
  4. A white powdery substance used to prevent hands slipping from holds when climbing, sometimes but not always limestone-chalk.
  5. A platoon-sized group of airborne soldiers.
  6. The prediction that there will be no upsets, and the favored competitor will win.

Verb

  1. To apply chalk to anything, such as the tip of a billiards cue.
  2. To record something, as on a blackboard, using chalk.
  3. To use powdered chalk to mark the lines on a playing field.
  4. To record a score or event, as if on a chalkboard.


The above text is a snippet from Wiktionary: chalk
and as such is available under the Creative Commons Attribution/Share-Alike License.

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