A petrified fossil forms when

On the geologic time scale, eras are divided into

Most fossils form when organisms die and are buried in

The gradual change in living things over a long period of time is

The longest part of the geologic time scale is

The earliest life forms on Earth lived

The age of a rock given as the number of years since the rock formed is its

A footprint is a type of a ____ fossil

Why would a jellyfish have very little chance of becoming fossilized?

The fossil of an organism that covered a wide area but lived for just a short period of time is

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