Multiple choice

What chemical process is used to turn sand into glass?

  1. melting the sand, then cooling it

  2. mixing the sand with obsidian

  3. deep freezing oil before combining it with sand

  4. separating the sand's molecules into basic elements
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A Correct answer
Explanation

Glass is manufactured by heating sand (silica) to a very high temperature until it melts, then shaping and cooling it to form a solid, transparent material.

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