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Relative Dating Answers

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The image shows sedimentary rock layers with index fossils and a fault.

Question illustration
A
Layer 8 is older than layer 1.
B
Layer 3 is younger than layer 6.
C
Layer 4 and layer 10 are the same relative age.
D
Layer 2 and layer 9 are the same relative age.
2
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The diagram shows horizontal rock layers.

Question illustration
A
Layer C is younger than layer A.
B
Layer D has an older relative age than layer C.
C
If a geologic event tilted these layers, layer B would no longer be the oldest.
D
It is possible to determine the absolute age of layer C with the information given.
3

Which statement explains one reason why unconformities occur?

A
Rocks along a fault break and move.
B
Igneous rock forms at Earth’s surface.
C
No sediment is deposited over a long time.
D
Igneous rock forms between sedimentary layers.
4

Which is the first step that geologists must do to compare rock layers at distant locations?

A
find the absolute age of rocks at both locations
B
compare a layer at one location to layers at other locations
C
identify index fossils in one or more layers at one location
D
collect fossils from different locations to study the organisms’ lifestyles
5

A geologist finds four layers of sedimentary rock. She determines that no geologic events have shifted the layers. She labels the layers A, B, C, and D from the top to the bottom.Which statement about these layers is accurate?

A
A is older than B.
B
B is older than C.
C
C is younger than A.
D
B is younger than D.
6

How do index fossils help scientists?

A
They aid in the study of ranges of different organisms.
B
They advance understanding of the origin of life on Earth.
C
They aid in comparison of rock layers at distant locations.
D
They advance understanding of rock type at the time the organism lived.
7

Which characteristic is shared by intrusions and faults?

A
All are cracks.
B
All are igneous rocks.
C
All cause gaps in the geologic record.
D
All are younger than surrounding rocks.
8

In which situation is the principle of cross-cutting relationships useful in determining relative age?

A
A fault breaks through sedimentary layers.
B
Fossils of two different species are found in different rock layers.
C
Sedimentary layers form over millions of years in a lake bottom.
D
Lava flows form on top of one another from several eruptions over time.
9

Which correctly lists three different geologic features that help scientists determine the relative ages of rocks by their positions?

A
magma, erosion, and intrusions
B
erosion, magma, and cross-cutting relationships
C
intrusions, index fossils, and magma
D
index fossils, intrusions, and cross-cutting relationships
10

Which phrase describes the absolute age of a rock?

A
does not provide an exact age
B
is the number of years since it formed
C
is the age compared to other rocks around it
D
indicates whether it is younger or older than the rocks above it

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