Which of the following elements is the least abundant in the Earth's crust

Name: Which of the following elements is the least abundant in the Earth's crust
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Question

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Calcium, while still relatively abundant, is less common in the Earth's crust compared to silicon, aluminum, iron, and oxygen. Oxygen is the most abundant element in the Earth's crust, followed by silicon, aluminum, and iron, making calcium the least abundant among the options provided.

Which of the Following Elements Is the Least Abundant in the Earth's