Study Guide Geologic Time 8th grade

Based on the Law of Superposition, what can be concluded about fossils?

• Fossils give clues about past climate patterns
• Fossils form from the hard parts of organisms
• The oldest fossils are found in the lowest rock layers
• The most recent fossils were advanced organisms

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NGSS.MS-ESS1-4

The Law of Superposition states that, in horizontal layers of sedimentary rock, each layer is _______.

• Younger than the layer above it and older than the layer below it
• Neither older nor younger than the other layers
• Older than the layers above it and younger than the layer below it
• Always older than any vertical layers

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NGSS.MS-ESS1-4

Which of the following does the fossil record suggest about life on Earth

• That most species have always been here
• That mutations are the reasons for evolution
• That life came to Earth on an asteroid
• That living species have changed over time

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NGSS.MS-LS4-1

Index fossils are fossils of organisms that lived only briefly and are found in many different places. These characteristics of index fossils make them most useful in determining which of the following?

• The places where different organisms evolved
• The number of different species that lived on Earth
• The relative age of rock layers in which they are found
• The precise age of Earth at the time the organisms lived

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NGSS.MS-ESS1-4

What is the age of intrusion G in relation to the sedimentary rock layers through which it passes

• Intrusion G is older than the rocks through which it passes
• Intrusion G is the same age as the rocks through which it passes 
• Intrusion G is younger than the rocks through which it passes
• Intrusion G may be older or younger than the rocks through which it passes

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NGSS.MS-ESS1-4

The lower boundary of layer B represents an unconformity. Which geologic process was responsible for creating the unconformity?

• Weathering
• Faulting
• Erosion
• Melting

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NGSS.MS-ESS1-4

NGSS.MS-ESS2-2

The imprint of an animal track in sedimentary rock is an example of a ____.

• Rock fossil
• Cast fossil
• Mold fossil
• Trace fossil

Which of the following best describes the geologic time scale?

• It is a record of the thickness of sedimentary rock
• It is a record of the rate of fossil formation
• It is a record of the life forms and geologic events in Earth's history
• It is a record of the time since the extinction of the dinosaurs

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NGSS.MS-ESS1-4

The geologic time scale spans all of the time that Earth has existed. How were the major divisions of the geologic time scales determined ?

• Evidence of asteroids hitting Earth
• Evidence of the distribution of glaciers on Earth
• Evidence of major changes in the composition of the atmosphere
• Evidence of major changes in the life forms on Earth

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NGSS.MS-ESS1-4

The geologic time scale is subdivided into_________.

• Relative ages
• Unconformities
• Absolute ages
• Eras and periods

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NGSS.MS-ESS1-4