Fossils and Geologic Time

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How do most changes on Earth occur?

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Gradually

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The creation of the Grand Canyon is an example of:

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Uniformitarianism

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Paleozoic, Mesozoic & Cenozoic are all:

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Eras

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Front

What type of event usually marks the end of an Era?

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A Mass Extinction

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Front

A supervolcano erupting and covering the country in ash would be an example of:

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Catastrophism

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Front

What is the principle of uniformitarianism?

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The idea that the same geological processes that operate today also operated in the past.

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What is catastrophism?

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The theory that Earth's features are shaped by sudden, short-lived, and violent events.

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What is a fossil?

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The preserved remains or traces of ancient organisms.

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What is the significance of the fossil record?

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It provides evidence of the history of life and the changes in organisms over time.

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What marks the beginning of the Paleozoic Era?

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The Cambrian Explosion, a rapid diversification of life.

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