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Subject: How is glass made?
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aimal 27.07.13 - 03:02pm
Glass is made by melting silica, a chemical that comes from sand. At extremely high temperatures, silica melts and becomes liquid. Other substances are usually added to the melted silica to make the glass strong. In its liquid state, glass can be molded into different shapes. Glass was first made at least 4000 years ago. *

aimal 28.07.13 - 05:50pm
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