How were the white cliffs of Dover, England, formed?

How were the white cliffs of Dover England formed

The white cliffs of Dover located on the southeastern coast of England, are composed of a variety of calcite shells, including single-celled plants called coccolithophores (a type of algae) that formed on the seafloor.  The conditions in the ocean were perfect to form these coccolithophores because the nitrite levels, low silicate concentrations, and the right amount of iron enabled them […]

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