How Are Chalk Crayons Made?
How Are Chalk Crayons Made? When you write with chalkboard chalk, you are writing with soft white limestone rock. But the limestone rock is first crushed to powder...
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What Is Hard Water?
“Hard” water is water that contains large amounts of dissolved minerals in contrast with “soft water”. The presence of these minerals in the water makes it difficult to...
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What Is Chalk?
Chalk is a soft, white limestone. The chemical composition is calcium carbonate with minor amounts of silt and clay. It was formed from the shells that belonged mostly...
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