Unit 4 - Geologic Time

What is the name of the most recent era in geologic time?

• Precambrian

• Paleozoic

• Mesozoic

• Cenozoic

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Which era lasted the longest?

• Cenozoic

• Mesozoic

• Paleozoic

• Precambrian

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The Earth is _____________________ years old.

• 4.6 million

• 4.6 billion

• 4.6 trillion

• 4.6 zillion

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What is stratigraphy?

• the study of the fossilized remains of plants and animals

• the study of the layers of rock

• the study of how the continents have moved and are still moving

• the study of how carbon is stored in Earth's permafrost

What is the Law of Superposition?

• All principle that states that rock layers were formed as horizontal layers

• A gap in rock layers due to erosion of a weak layer of rock

• A principle that states that an intrusive layer of igneous rock will always be younger than the rock it cuts through.

• A principle that states that the deeper a rock is, the older it is unless it has been disturbed or altered.

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What is the Law of Original Horizontality?

• All principle that states that rock layers were formed as flat layers

• A gap in rock layers due to erosion of a weak layer of rock

• A principle that states that an intrusive layer of igneous rock will always be younger than the rock it cuts through.

• A principle that states that the deeper a rock is, the older it is unless it has been disturbed or altered.

What is Relative Age Dating?

• The dating of rocks in how they compare to the rocks that are around them.

• The use of fossils to help find the age of a rock.

• The use of radioactive elements in rock to find a highly accurate estimate of the age of the rock.

• Dating of a rock layer based on how far it is from Earth's core.

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What is Absolute Age Dating?

• The dating of rocks in how they compare to the rocks that are around them.

• The use of fossils to help find the age of a rock.

• The use of radioactive elements in rock to find a highly accurate estimate of the age of the rock.

• Dating of a rock layer based on how far it is from Earth's core.

Which layer is the oldest?

• E

• A

• B

• C

• D

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Fossils such as footprints, burrows or droppings.

• Index Fossils

• Unconformities

• Petrified Wood

• Trace fossils