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copper, silver and carbon are not real ores but could be found as pure elements: carbon as coal, or diamond. Silver as nuggets. Copper as native copper specimen. Iron is almost never found in the free elemental state, and should be extracted from iron ore, which is not iron, but mainly made of iron oxides.

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17y ago
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6mo ago

Carbon is not an ore, as it is a non-metallic element and does not form minerals that can be mined for extraction. Copper, silver, and iron are all metallic elements that can be found in ores in the Earth's crust.

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Q: Which of these is not an ore copper carbon silver iron?
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