So as the plates move around, we know climate has changed, sea level has changed, we have a lot of different types of landscapes and different types of environments that we can go back -- if we have a time machine -- we can go back and look at, and we do indeed have a time machine because we can look at the rocks that were deposited at these times.
À medida que as placas se movimentam, sabemos que o clima mudou, o nível do mar mudou, temos muitos tipos de diferentes paisagens e diversos tipos de ambientes a explorar. Se tivéssemos uma máquina do tempo — podíamos recuar e observar. Mas temos uma máquina do tempo porque podemos olhar para as rochas que foram depositadas nessas épocas.