Relative Dating Answers

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Which statement about how geologists study the ages of rock layers is true?

A
The law of superposition means that older rocks are on top.
B
Geologists can find the exact age of a rock by looking at its relative position.
C
The principle of original horizontality provides the basis for the law of superposition.
D
Relative age can be determined by using the concept of unconformity.
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Use the law of superposition to choose the correct answer for the following questions about rock layers and relative age.

Answers:
Which layer is older than Layer 6?:Layer 8
Which layers are younger than Layer 4?:Layers 2 and 3
Selection 3:Layers 7 and 9
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Layers 3 and 5 ✔ Layers 2 and 3Layers 5 and 6

A
Layers 3 and 5
B
✔ Layers 2 and 3
C
Layers 5 and 6
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Layers 1 and 2 ✔ Layers 7 and 9Layers 4 and 6

A
Layers 1 and 2
B
✔ Layers 7 and 9
C
Layers 4 and 6
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Use the drop-down menus to answer the questions about the diagram.

Answers:
Letter H is a(n) .:intrusion
Which of these is youngest?:Letter G
Which of these was eroded?:Letter F
Which happened first?:Letter F was deposited.
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Letter ELetter F✔ Letter G

A
Letter E
B
Letter F
C
✔ Letter G
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Letter A✔ Letter FLetter I

A
Letter A
B
✔ Letter F
C
Letter I
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Letter I was deposited. Letter G occurred. ✔ Letter F was deposited.

A
Letter I was deposited.
B
Letter G occurred.
C
✔ Letter F was deposited.
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K, E, Q, W, B✔ B, W, E, Q, KB, Q, W, E, KK, E, W, Q, BB, W, E, K, Q

A
K, E, Q, W, B
B
✔ B, W, E, Q, K
C
B, Q, W, E, K
D
K, E, W, Q, B
E
B, W, E, K, Q
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Answer the questions about the diagram.

Answers:
Organism appears in the least outcrops.:D
Organisms are the oldest.:B and C
Organism would make the best index fossil.:A
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A and B✔ B and CC and DD and A

A
A and B
B
✔ B and C
C
C and D
D
D and A
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✔ ABCD

A
✔ A
B
B
C
C
D
D
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Geologists use tools other than the law of superposition to help them with relative dating. Which statements describe those tools? Check all that apply.An unconformity is created when lava pours out on Earth’s surface.Faults are the result of volcanic activity.Intrusions and extrusions are sedimentary formations.Cross-cutting features are always younger than the surrounding rock.When material erodes before sediment is deposited on it, a geologic gap results.

A
An unconformity is created when lava pours out on Earth’s surface.
B
Faults are the result of volcanic activity.
C
Intrusions and extrusions are sedimentary formations.
D
Cross-cutting features are always younger than the surrounding rock.
E
When material erodes before sediment is deposited on it, a geologic gap results.
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Which statements about this diagram are true? Check all that apply.

A
Layers 5 and 7 are the same age.
B
Faulting created the differences in layers.
C
Erosion created the differences in layers.
D
Layers 2 and 9 are the same age.
E
The organisms in 1 and 8 lived tens of millions of years apart.
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Answer the questions about the diagram.

Answers:
Organism appears in the least outcrops.:D
Organisms are the oldest.:B and C
Organism would make the best index fossil.:A

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