The top documents tagged [cooledwhy study glass]

Glass

Glass

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WHAT IS GLASS? FORCES THAT FRACTURE GLASS GLASS. HISTORICALLY Obsidian (volcanic glass) use as cutting tool 2500 B.C. glass beads in Egypt 1 st Century.

WHAT IS GLASS? FORCES THAT FRACTURE GLASS GLASS. HISTORICALLY Obsidian (volcanic glass) use as cutting tool 2500 B.C. glass beads in Egypt 1 st Century.

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