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Geologic Time Scale Lesson

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Questions and Answers

What is the main purpose of the geologic time scale?

To study the movement of tectonic plates

To measure the age of the Earth in exact years

To distinguish Earth's history based on life-forms (correct)

To identify the locations of fossils

What are fossils?

Pieces of meteorites found on Earth

Artifacts left behind by ancient civilizations

Samples of ancient air trapped in rocks

Remains or evidence of an organism from the geologic past (correct)

How do geologists establish the existence of Earth's pre-human history?

By studying ancient weather patterns

Through the use of satellite imagery

By analyzing the composition of modern rocks

Through the discovery of fossils (correct)

What is the Phanerozoic eon characterized by?

Abundant, complex fossilized remains Signup and view all the answers

What is the informal term used to refer to the Hadean, Archean, and Proterozoic eons collectively?

"Precambrian" Signup and view all the answers

What is the main function of the geologic time scale?

To classify Earth's history based on life-forms and geological events Signup and view all the answers

What characterizes the Phanerozoic eon?

Presence of abundant and complex fossilized remains Signup and view all the answers

What defines a geologic eon?

Hundreds or thousands of years Signup and view all the answers

What is the informal term used to collectively refer to the Hadean, Archean, and Proterozoic eons?

"Precambrian" Signup and view all the answers

What are fossils primarily composed of?

Silt or rock Signup and view all the answers