Wednesday, 19 October 2011

Becomming a Fossil:

1. For a dead animal to become a fossil, it needs to be buried quickly before it is eaten or decomposes, by falling into a muddy river bed, or by a sandstorm, for example.
2. Soft tissue rots away, but the skeleton remains to be replaced by minerals and turned to rock over millions of years.
3. Over time, mud and river sediments build up over the fossil, forming layer upon layer of sedimentary rocks.
4. One more millions of years, erosion and movements in the Earth's crust can expose the fossil, and, with luck, a palaeontologist may find it.