Chapter 13 Earth's History

How do sedimentary rocks form on Earth’s surface?

• in vertical stripes

• with no clear pattern

• in horizontal layers

• in a crisscross pattern

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What are strata?

• inconsistencies in the fossil record

• rock layers

• well-known and widespread fossils

• units of time

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What is normally found at the lowest stratum?

• all of the fossils

• all of the volcanic ash

• the youngest rock

• the oldest rock

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Stratigraphy is the study of

• evolution.

• human history.

• rock layers.

• Earth’s atmosphere.

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NGSS.MS-ESS1-4

NGSS.MS-ESS2-3

Which of the following is not a unit of geologic time?

• epoch

• millennium

• era

• age

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Which of the following describes the relative age of someone or something?

• Kaitlyn is younger than Dillon

• Dillon is 13 years old

• The trilobite is an index fossil.

• The trilobite appeared 521 million years ago.

True or false: Sometimes older rocks end up on top of younger rocks.

• True

• False

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Using a substance’s rate of decay to determine its age is an example of

• relative dating.

• using index fossils.

• chemical engineering.

• absolute dating.

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What happened during the Cambrian explosion?

• Dinosaurs went extinct.

• Many animals first appeared.

• Single-celled life first appeared.

• Humans first appeared.

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Which of the following rock layers contains the youngest fossils?

• A

• B

• C

• D

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NGSS.MS-ESS1-4