In what era do we live?

Approximately how old is Earth?

What is the break down of spans of time in Earth history from largest to smallest?

Why do scientists study fossils?

How do fossils form?

Why do some organisms not leave behind fossil imprints?

In what types of rock do fossils form?

What is an index fossil?

What characteristics do all index fossils share?

What does the law of fossil succession state?

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