The two correct answers for why bauxite is the most common ore from which aluminum is extracted are:
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It is the most abundant ore of aluminum - Bauxite is the primary source of aluminum, making it the most common ore used in the extraction process.
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It can easily be strip-mined - Bauxite deposits are often located near the surface, which makes them accessible for strip-mining, a cost-effective extraction method.
The other statements do not accurately describe bauxite's characteristics. For example, while bauxite can be refined to extract aluminum, it is not refined in a single step, and it does not contain pure aluminum metal. Additionally, bauxite is not typically used in jewelry as a gem.