*A dinosaur dies and sinks to the ocean floor., *The soft parts of the body rot away., *The dinosaur is buried by mud and sediments., *Minerals help to preserve the bones and harden them., *After millions of years, more mud, sediment and sand pile up in layers adding weight and pressure, turning the layers into rock.,

per en/la

Tauler de classificació

Estil visual

Opcions

Canvia de fonament

Restaurar desada automàtica: ?