🪨 Rock cycle 3D
Rock / material
Sedimentary rock
Layers of sediment are buried, squeezed (compaction) and glued by minerals (cementation). It is the only rock type that holds fossils — and it covers about three-quarters of the land surface.
Examples: Sandstone, shale, limestone (often from shells), chalk, coal
| Type | How it forms | Clues |
|---|---|---|
| 🔥 Igneous | Magma/lava cools | Interlocking crystals, no layers |
| 🌊 Sedimentary | Layers of grains cemented | Layers, rounded grains, fossils |
| 💎 Metamorphic | Heat & pressure change rock | Bands, aligned crystals, very hard |