Asked by Michael

2 facts about the earths crust, mantle, outer core, and inner core.

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Answered by GPT-5 mini AI
Crust
- Outermost, thinnest layer (about 5–70 km thick): oceanic crust ~5–10 km, continental crust ~30–70 km.
- Made of solid silicate rocks (oceanic = basalt, continental = more granitic) and forms the brittle tectonic plates.

Mantle
- Thick layer ~2,900 km deep that makes up most of Earth’s volume.
- Composed of silicate minerals rich in magnesium and iron (e.g., peridotite); behaves solid but flows slowly (viscoelastic convection) that drives plate motions and mantle plumes.

Outer core
- A liquid layer ~2,200 km thick made mainly of molten iron and nickel.
- Flowing, electrically conducting fluid produces Earth’s magnetic field (geodynamo); S-waves do not travel through it.

Inner core
- A solid sphere about 1,220 km radius, composed primarily of iron (with some nickel); solid because of extremely high pressure despite very high temperatures (~5,000–6,000 °C).
- Transmits P-waves and may rotate slightly differently from the mantle; its properties influence the long-term behavior of Earth’s magnetic field.