AnswersBiology VIA Fall 2026 Lstrangesdale.orgGeologic Time

Geologic Time Answers

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1
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Which unit of geologic time is the oldest?

A
Cenozoic
B
Mesozoic
C
Ordovician
D
Precambrian
2
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Which period is older than the Triassic period?

A
Cambrian
B
Cretaceous
C
Jurassic
D
Paleogene
3

Which process contributes to the formation of layers in protoplanets when unstable elements release particles and energy?

A
compaction
B
evaporation
C
radioactive decay
D
collision of space materials
4

What is the purpose of a geological time scale ?

A
It used to predict natural disasters throughout Earth’s history.
B
It is used to present the correct sequence of events in the Earth’s history.
C
It is used to determine the absolute dates in years for different periods.
D
It used to create a naming system for flora and fauna.
5

Which evidence is most likely used to indicate the beginning of solar system formation?

A
Materials combined to form a mass.
B
Materials were pulled together by gravity.
C
Water condensed and collected to form oceans.
D
Different species of microorganisms lived on Earth.
6

How did the formation of the ozone layer contribute to the existence of life on Earth?

A
It blocked the Sun’s harmful UV rays.
B
It caused water vapor to cool, condense, and collect.
C
It released large amounts of oxygen into the air.
D
It warmed Earth’s surface, preventing materials from freezing.
7

Study the graph about oxygen content of Earth’s atmosphere.Which describes oxygen content as Earth evolved over time?

Question illustration
A
Oxygen levels sharply declined about 400 million years ago.
B
Oxygen levels stay above 15 percent starting 200 million years ago
C
Oxygen levels remain below 5 percent starting 1000 million years ago.
D
Oxygen levels raise significantly between 1000 and 700 million years ago.
8

What information does the geologic time scale provide about Earth's history?

A
Reasons why organisms change into different species
B
Locations where ancient organisms lived
C
How plants and animals interact in ecosystems
D
The sequence and timing of major events in Earth's history
9

The table shows index fossils.

Question illustration
A
Life forms existed during the Cambrian period.
B
Similar fossil species formed after the Devonian period.
C
This fossil species first appeared during the Cenozoic era.
D
Different life forms were surviving during Precambrian time.
10

Study the geologic time scale.The Eocene period exists in Earth’s history around 34 MYA. What could a scientist do to determine what era the Eocene period belongs to on the geologic time scale?

Question illustration
A
learn what happened during Precambrian time
B
study information related to the Cenozoic era
C
view the timing of events in the Mesozoic era
D
research events that happened during the Paleozoic era

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Geologic Time Answers — Biology VIA Fall 2026…