WJEC GCSE Chemistry Practice Exam

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Which part of Earth is a dense sphere at the center made of iron and nickel?

Crust

Mantle

Outer Core

Inner Core

The central part is the inner core. It’s a dense solid sphere made mainly of iron and nickel, kept solid by the immense pressures at Earth's center. Surrounding it is the outer core, which is liquid iron–nickel and helps generate Earth’s magnetic field. The crust and mantle are rocky and less dense, sitting above the core. So the description matches the inner core precisely.

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