Copper
Tin
Iron
Aluminium
Answer is Wrong!
Answer is Right!
The correct answer is: D. Aluminium.
Ruby and sapphire are both gemstones that are varieties of the mineral corundum. Corundum is an aluminum oxide mineral with the chemical formula Al2O3. It is a hard, brittle, and transparent mineral that is typically red, blue, or green in color.
Ruby is a red variety of corundum that is caused by the presence of
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