The word fossil comes from the Latin word, fossus, which means having been dug up

The oldest known pieces of our planets surface are 4.4 billion year old zircon crystals from Jack Hills of WA

Salt is crystallised sodium chloride. Salt crystals from when water evaporates from a saltwater mixture

A solid figure that is made up of a repeating pattern of geometric shapes is known as a crystal. Crystals form when a liquid cools and hardens

It's not just animals that fossilise you know! You can even find fossils of poo. These are called coprolites. Scientists have even found some from t-rex

Fossils can sometimes look like bones but they're not. Fossils are made from rock which is shaped exactly the same as the object that was originally there