Workshop Technology
Thermit, used in Thermit welding, is a mixture of

Charcoal and iron oxide
Charcoal and aluminium
Charcoal, iron oxide and aluminium
Iron oxide and aluminium

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Workshop Technology
The purpose of a gate is to

Act as a reservoir for the molten metal
Delivers molten metal from pouring basin to gate
Feed the molten metal to the casting in order to compensate for the shrinkage
Delivers molten metal into the mould cavity

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