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After that, depending on where the animal dies, the process of fossilization can occur in different ways.For most fossils there are three basic things that are needed: sediment, pressure, and time.Fossils are the remains of animals or plants that lived a long time ago.

More sediment settles on the remains, and time and pressure turn the sediment surrounding the bones and teeth to stone.

Some organic material, like tree trunks, can be petrified.

Petrification happens when the organic material is slowly replaced by minerals. Making a fossil is tricky and the conditions have to be just right.

Footprints, flowers, even droppings; all of these things can be turned into fossils under the right conditions.

A fossil only becomes a fossil when it has reached a certain age.

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