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Posts tagged chalk

August 7, 2017


As the plankton died, they fell to the ocean floor where they consolidated into mud, and then, over time, into the white chalk seen today.

The White Cliffs Of Plankton

Naturally formed chalk rock could be described as a graveyard for plankton.

December 1, 2005


Eating, but Not Food

Toddlers and slightly older children are prone to chew on things that make adults react with alarm. However, for many children between the ages of two and three, compulsively eating non-food items is an eating disorder known as pica. Learn more on this Moment of Science.

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