KS3 Science · Earth structure
Explore the layers beneath your feet, then watch how cooling speed decides whether a rock ends up with big crystals or small ones.
Tap a layer on the diagram — or step through them in order. The crust really is this thin compared with what’s below it.
Diagram not to scale — the crust is far thinner in reality.
Pick a layer to reveal what it’s made of.
Igneous rock — rock formed from cooling magma or lava. The big question: how fast did it cool? That decides the crystal size.
Choose where it cools, then press “Cool the rock” and watch the crystals grow.