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How is glass made?

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(2)
Use the verbs in the correct form to complete the text (present and past).

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How is glass made?

Use the verbs in the correct form to complete the text (present and past).

Diana Fúneme
1

is heated called turned mixed cooled heated made added referred

How is glass made ?
COOL TURN HEAT MAKE REFFER

Glass is 1 from liquid sand . Ordinary sand is 2 at a temperature of 1700 °C . After it is molten and 3 it gains a different structure . But it doesn't matter how much you cool the sand , it is never 4 into a solid . Instead , it becomes a kind of frozen liquid 5 by scientists as amorphous solid .

MIX BE HEAT

In a commercial glass plant , sand 6 7 with waste glass ( from recycling collections ) , soda ash ( sodium carbonate ) , and limestone ( calcium carbonate ) and 8 in a furnace .

CALL ADD

The soda reduces the sand's melting point , which helps to save energy during manufacture , but it has an unfortunate drawback : it produces a kind of glass that would dissolve in water ! The limestone is 9 to stop that happening . The end - product is 10 soda - lime - silica glass . It's the ordinary glass we can see all around us .