AnswersBiology VIA Fall 2026 Lstrangesdale.orgGeologic Time

Geologic Time — Unit test Answers

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1
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Which important event in Earth’s history occurred during the Jurassic period?

A
The first birds emerged on Earth.
B
Mammals were in search of food.
C
Animals with shells emerged on Earth
D
Treelike ferns first began to grow and populate.
2
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Which period belongs to the Paleozoic era and not the Cenozoic era?

A
Devonian
B
Neogene
C
Paleogene
D
Quaternary
3

Which event is most likely if an index fossil is found in a layer at location 1, but the layer and index fossil are not found at location 2 nearby, which is known to be the same relative age?

A
The layer at location 2 is too old to contain fossils.
B
The locations were too close together.
C
The organism did not exist at location 2.
D
The layers at location 2 formed much earlier than those at location 1.
4

What determines the length of a geologic time period?

A
fossil record
B
material density
C
meteors and rocks
D
radioactive materials
5

The diagram illustrates radioactive decay.

Question illustration
A
Structure 1 is an unstable atom that turns into structure 2, a new atom.
B
Structure 1 is a stable element that breaks down into structure 2, an unstable element.
C
Structure 1 is a radioactive element that loses particles to create structure 2, released energy.
D
Structure 1 is a radioactive atom that decays into structure 2, half of the original unstable element.
6

Allison drew a diagram to illustrate radiation.

Question illustration
A
X: MatterY: Empty space
B
X: Large massY: Small mass
C
X: HotY: Cold
D
X: EarthY: Sun
7

The image shows locations of fossils from different geologic periods in Virginia.Which association correctly links the time period with the location of the fossils?

Question illustration
A
Pennsylvanian eastern and western Virginia
Option A
B
Cambrian throughout southern Virginia
Option B
C
Tertiary eastern Virginia
Option C
D
Quaternary eastern and western Virginia
Option D
8

Which phrase describes faults?

A
cause gaps in the geologic record
B
cause rocks to break and move
C
are older than surrounding rocks
D
are igneous rocks that form beneath Earth’s surface
9

Which statement accurately describes a half-life?

A
A rock’s size is determined by half-life.
B
All stable and unstable elements have a half-life.
C
An atom of an element becomes half its original size in a half-life.
D
A half-life is the time required for half of a radioactive element to decay.
10

Which characteristic of potassium makes it useful for dating rocks?

A
It has a long half-life.
B
It decays at an unknown rate.
C
It produces lead as it breaks down.
D
It can be used to date all types of rock.
11

Which best explains how scientists confirmed that the moon formed around the same time as Earth?

A
Scientists determined the approximate age of fossils from the moon and Earth.
B
Scientists used radioactive dating to study the age of material from the moon and Earth.
C
Scientists explored the cycle of condensation and evaporation over time on the moon and Earth.
D
Scientists analyzed the content of gases that were part of the atmospheres on the moon and Earth.
12

The image shows sedimentary rock layers.

Question illustration
A
1
B
2
C
3
D
4
13

Which statement describes the law of superposition?

A
Sedimentary rocks were originally in horizontal layers.
B
In horizontal rock layers, each layer is younger than the one below it.
C
Rock layers must be in existence before something can happen to them.
D
Rocks that are not in horizontal layers were shifted by some geologic event.
14

Which is an example of radiation?

A
A melting snowman sweats drop of water under a bright sun.
Option A
B
A smiling man roasts marshmallows over a wood fire.
Option B
C
A cook stirs vegetables in a frying pan over a gas burner.
Option C
D
Three pairs of bare feet and lower legs walk across black pavement.
Option D
15

Which is the correct order of materials in terms of reflectivity, from least to greatest?

A
brown soil, beige sand, white paper, black asphalt
B
white paper, beige sand, brown soil, black asphalt
C
black asphalt, brown soil, beige sand, white paper
D
beige sand, white paper, black asphalt, brown soil

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1.4 Geologic Time