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Which mineral, with the formula CaCO₃, is the main component of most limestone?
Answer
Calcite
Which mineral contains the oldest known material formed on Earth, with zircon crystals dated to about 4.4 billion years?
Answer
Zircon
What is the name of the solid central layer of Earth, made mainly of iron and nickel?
Answer
Inner core
What metamorphic rock forms when limestone is recrystallized by heat and pressure?
Answer
Marble
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Which rock is the world’s main source of aluminum?
Answer
Bauxite