Chalk is made from the fossil remains of Plankton.
More precisely; Chalk is made from Calcite, or Calcium Carbonate, which was shed by plankton 90 million years ago and accumulated on the sea floor.

Chalk is made from the fossil remains of Plankton.

More precisely; Chalk is made from Calcite, or Calcium Carbonate, which was shed by plankton 90 million years ago and accumulated on the sea floor.

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