chalk

     

Chalk (pronounce /ˈtʃɔːk/) is a soft, white, porous sedimentary rock, a form of limestone composed of the mineral calcite. It forms under relatively deep marine conditions from the gradual accumulation of minute calcite plates (coccoliths) shed from micro-organisms called coccolithophores. It is common to find flint and chert nodules embedded in chalk.

Trivia about chalk

  • (Franz reads the clue.) Some cops use this soft powdery limestone to mark tires; homicide cops, like Andy, see it used more for outlines
  • A form of calcium carbonate makes up the bulk of this blackboard accessory
  • The flint seen here is from a stratum of this stuff you might use to write "I will answer in the form of a question" 100 times
  • This sedimentary rock, "Creta" in Latin, was formed from marine life during the Cretaceous period
  • The verb is how the score is kept in many darts games; it can come before "up", as in "___ it up to experience"
  • As evidenced by Dover, England, the Cretaceous period's name derives from this type of limestone
  • The everyday type of it is calcite; the type rock climbers use to get a grip is magnesium carbonate

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