Which of the following elements is found in the Earth's crust as well as in the mantle and inner and outer cores?

Name: Which of the following elements is found in the Earth's crust as well as in the mantle and inner and outer cores?
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Iron is found in all the layers of the Earth - the crust, mantle, inner core, and outer core. While the other three elements (aluminum, oxygen, and silicon) are all important components of the Earth's crust, they are not found in the inner and outer cores.

Which of the Following Elements Is Found in the Earth's