AnswersTX-Earth and Space Science AUnit Test

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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Layer 2 Layer 4 ✔ Layer 8

A
Layer 2
B
Layer 4
C
Layer 8
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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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✔ intrusionextrusionfault

A
intrusion
B
extrusion
C
fault
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Which of these is youngest?

A
Letter E
B
Letter F
C
Letter G
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Which of these was eroded?

A
Letter A
B
Letter F
C
Letter I
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Which happened first?

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