AnswersBiology VIA Fall 2026 Lstrangesdale.orgGeologic Time

Geologic Time Answers

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What was the significance of collisions of dust, rock, and ice during Earth’s formation?

A
to modify the density of materials present on Earth
B
to facilitate heat absorption from the surrounding space
C
to blow away a strong burst of particles from the first atmosphere
D
to harden materials to form different parts of Earth’s layers
2
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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.
3

Which led to the formation of oceans after water on Earth’s surface evaporated?

A
The sun released a strong burst of water vapor.
B
As Earth cooled, water in the atmosphere condensed.
C
Materials collided due to strong gravitational forces.
D
The ozone layer formed to protect against harmful UV ray exposure.
4

Which best explains how gravity contributes to the formation of layers in protoplanets?

A
Gravity attracts materials and causes compaction, which produces heat and leads to the melting, sinking, and rising of materials.
B
Gravity causes materials to undergo radioactive decay, which produces heat and leads to the melting, sinking, and rising of materials.
C
Gravity absorbs heat, which cools materials and causes them to sink and rise.
D
Gravity releases heat into space, which cools materials and causes them to sink and rise.
5

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.
6

What caused Earth's oceans to begin forming during Precambrian Time?

A
Earth's temperatures increased, causing evaporation
B
Comets added frozen water directly to the oceans
C
Oxygen levels increased due to photosynthesis
D
Water vapor condensed as Earth's surface cooled
7

Which event in Earth’s history most directly allowed life to exist on land?

A
Earth’s temperatures increased, causing widespread evaporation.
B
Earth collided with a large object, forming the moon.
C
Single-celled organisms released oxygen into the air when they photosynthesized.
D
Single-celled organisms absorbed harmful gases from the air when they first formed.
8

Why is radioactive dating important when approximating the age of Earth?

A
Scientists can identify different life forms using index fossil records.
B
Scientists can examine how temperature changes within Earth’s interior.
C
Scientists can determine the order of when rocks formed on Earth.
D
Scientists can analyze changes in chemical concentration of atmospheric gases.
9

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.
10

What does the geologic time scale confirm about the Cretaceous period?

A
It ended during the Cenozoic era.
B
It ended during the Mesozoic era.
C
It started before Precambrian time.
D
It started before the Cambrian period.

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