Sand to rock
· From sand to rock—quickly! Published: 3 November 2009 (GMT+10) As this picture of a toy car encased in stone shows (see Toy car rocks millionyear belief), you don't need millions of years for sediment to harden into researchers have identified that the process can be helped along by microbes secreting cementing agents (as a byproduct of their normal metabolic processes).
![whatsapp](/images/whatsapp.png)