Is Earth’s core changing the way it rotates?

Crust

1 The crust makes up half of Earth’s hard external layer. It includes both the continents and the ocean floor. The crust’s contents are different from those of the underlying mantle, enriched with the likes of silicon, uranium, potassium, so that the crust is a mosaic of rock types.

■ DEPTH: 0-75km
■ TEMPERATURE: 0-400°C

Mantle

2 The mantle below the Earth’s crust has a fairly