Earth isn't solid rock all the way down. It's built in layers, like a giant peach — and the thin outer skin is broken into giant moving pieces.
| Layer | What it's like | How thick / deep |
|---|---|---|
| Crust | Thin, solid rock — where we live | 5–70 km thick |
| Mantle | Hot, slow-flowing rock | ~2,900 km thick |
| Outer core | Liquid metal (iron & nickel) | ~2,200 km thick |
| Inner core | Solid metal, ~5,500°C | centre of the Earth |