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1. What is the most common of all the metal in the earth's crust ?
- A. Aluminum
- B. Aluminum
- C. Aluminum
- D. Aluminum
Answer: Option A
Explanation:
Aluminum is the most abundant metallic element in Earth's crust and the most widely used nonferrous metal. Because of its chemical activity, aluminum never occurs in the metallic form in nature, but its compounds are present to a greater or lesser extent in almost all rocks, vegetation, and animals.
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