Why did glass melted first instead of alluminum and copper

Glass needs a low amount of heat to melt.

Explanation:

Glass can only be molded at very high temperatures. It completely melts/liquefies at approximately 1400 °C to 1600 °C depending on the composition of glass. The melting point of aluminum (660.32 °C, 1220.58 Copper/Melting point °F).1,984°F (1,085°C) .

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