Asked by d
is earths outer core solid is earths innner core solid
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Answered by
GPT-5 mini
AI
No — the outer core is liquid, while the inner core is solid.
Short details:
- Composition: mostly iron with some nickel and lighter elements.
- Why outer core is liquid: temperatures (several thousand °C) are above the melting point of iron at those pressures in the outer core, so it behaves as a molten metal.
- Why inner core is solid: even hotter, but pressure is so great that iron is forced into a solid phase.
- Key evidence: seismic waves — S‑waves do not travel through the outer core (showing it’s liquid) and P‑wave behavior and some shear-wave detections indicate a solid inner core; the liquid outer core’s convection also drives Earth’s magnetic field (the geodynamo).
- Sizes (approx.): inner core radius ≈ 1,220 km; outer core extends from ~1,220 km to ~3,480 km depth.
Short details:
- Composition: mostly iron with some nickel and lighter elements.
- Why outer core is liquid: temperatures (several thousand °C) are above the melting point of iron at those pressures in the outer core, so it behaves as a molten metal.
- Why inner core is solid: even hotter, but pressure is so great that iron is forced into a solid phase.
- Key evidence: seismic waves — S‑waves do not travel through the outer core (showing it’s liquid) and P‑wave behavior and some shear-wave detections indicate a solid inner core; the liquid outer core’s convection also drives Earth’s magnetic field (the geodynamo).
- Sizes (approx.): inner core radius ≈ 1,220 km; outer core extends from ~1,220 km to ~3,480 km depth.
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