Light elements in Earth’s outer core
Which light elements are alloyed with iron in Earth’s outer core?
Summary
The outer core is less dense than iron or iron–nickel would be at its pressure and temperature, so lighter elements must be present; which ones, and how they are distributed, is unresolved.
Source
Open, as listed by Wikipedia · Unsolved problems in geoscience. Checked 29 Sep 2026.
The status is the source’s. Papex does not decide whether a problem is solved.
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