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Chalk: A biological limestone formed from shell debris
Students create organic chalks made out of rice flour and eucalyptus
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Oxford Academy Reynosa - Chalk is made of the calcareous remains of trillions of microscopic fossil plankton. Composed principally of calcium carbonate (CaCO3), chalk is formed underwater by slow accumulation and compression
:strip_icc()/ScreenShot2021-06-09at11.37.42AM-fd0e87b7e26b46c4a77914e49ebe1d4a.jpg "What Is Chalky Paint? And How to Use It")
What Is Chalky Paint? And How to Use It
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How chalk is made - material, making, used, processing, procedure, product, industry
