Why are the White Cliffs of Dover white?

Tiny creatures are responsible for the color of the cliffs, which stretch for eight miles (13 km) along England’s coastline. The cliffs began to form 70 million years ago when a shallow sea covered the region. Microscopic algae called coccolithophores floated in this sea. When they died, their white calcium skeletons sunk to the bottom, forming a white mud that grew thicker over time. When the seas receded, the mud dried into the white, crumbly chalk we see on the cliffs today.


Picture Credit : Google