What does the geologic time scale represent?

What do scientists think the first life form was?

What is a fossil?

What parts of organisms are most likely to become fossilized?

Why do scientists study fossils?

Fossils can show how the earth\'s __________has changed over time.

How can the relative age of fossils and rock layers be determined?

The Law of Superposition states:

What would you use to radio date a 1,000,000 year old fossil?

A natural fuel that was formed from the remains of once living organisms:

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