Unit 8 Practice Test

The geologic cross section below shows several rock units of

Earth’s crust. Some rock units are labeled A through E.

Which two rock units formed from Igneous Rock Intrusions?

• C, D

• A, E

• D, A

• B, E

Geologic history is divided into eras, periods, and epochs

based on the...

• type of rock deposited at different times throughout

  history

• half‐life of radioactive isotopes found in rocks

• inferred movements of Earth’s landmasses

• fossil evidence found in bedrock

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A cross section of Earth’s crust is represented below. Index

fossils are present in some of the rock layers.

These rock layers indicate evidence of past crustal movement

based on the principle of

• up welling

• Contact Metamorphism

• Original Horizontality

• Cross Cutting

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In the cross section shown, if layer 2 is 299-318 million years

old, and layer 7 is 488-542 million years old, which of these is

most likely correct?

• Layer 2 is younger than layer 1

• Layer 3 is 317 million years old

• Layer 4 is less than 318 million years old

• Layer 5 is younger than layer 6

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A fossil that contains carbon‐14 is found. Carbon‐14 has a

half‐life of 5730 years. If the bone has 50% of its carbon 14

remaining, how many half‐lives have gone by?

• 1

• 2

• 3

• 4

Volcanic ash has occasionally formed molds of animals. This

occurs when the ash covers the animal and —

• replaces the animals soft tissue

• enters the animal's body

• Hardens before the animal's body decays

• Mineralizes the animal's bones

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The cross sections represent three bedrock outcrops, 1, 2, and

3, found several kilometers apart. The geologic time period

when each sedimentary rock layer formed is shown. The

symbols represent fossils of different types of organisms

present in the rock layers.

Fossils from which time period could not be dated using

carbon-14?

• Cambrian

• Mississippian

• Pennsylvanian

• Permian

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In the illustration, which layer is an example of an intrusion?

• 3

• 2

• 1

• 4

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Which of the following most likely results in the formation of a

fossil?

• A Mesozoic clam is buried by a mudslide

• A Mesozoic clam is eaten by a large predatory fish.

• A Mesozoic clam is washed up onto the beach.

• A Mesozoic clam lies exposed on the surface of the sea

  floor.

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Which aspect of this rock formation occurred at the earliest

time?

A. The

• The top sedimentary layer labeled A

• The igneous intrusion labeled B

• The fault labeled C

• The folding of the layers labeled D

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