Which layer is described as the central, metallic sphere of the Earth?

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Multiple Choice

Which layer is described as the central, metallic sphere of the Earth?

Explanation:
Earth’s inside is built in layers, with a metallic region at the very center. That central, metallic sphere is the inner core, made mainly of iron and nickel. The core as a whole includes the solid inner core and the surrounding liquid outer core. The crust sits on top of the mantle, and the atmosphere is the gaseous blanket around Earth, not part of the interior. So, describing the central, metallic portion points to the core. The crust and mantle are outer layers, and the atmosphere is not a layer of the planet’s interior.

Earth’s inside is built in layers, with a metallic region at the very center. That central, metallic sphere is the inner core, made mainly of iron and nickel. The core as a whole includes the solid inner core and the surrounding liquid outer core. The crust sits on top of the mantle, and the atmosphere is the gaseous blanket around Earth, not part of the interior. So, describing the central, metallic portion points to the core. The crust and mantle are outer layers, and the atmosphere is not a layer of the planet’s interior.

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