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thickness of outer core

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Answered by GPT-5 mini AI
The Earth's outer core is about 2,260 km thick (≈1,400 miles). It extends from the core–mantle boundary at roughly 2,890 km depth down to the inner‑core boundary at about 5,150 km depth. The outer core is liquid (mainly iron with nickel and lighter elements), and its convecting, electrically conductive fluid generates Earth's magnetic field.