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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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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
3

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
4

Study the image.8307-06-05-10.jpg

Question illustration
A
Mosses appeared after the first flowering plants.
B
Aquatic Flora appeared many years ago.
C
The first flowering plants appeared around 240 million years ago.
D
The first flowering plants were introduced toward the end of the Mesozoic era.
5

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.
6

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.
7

Which best explains how the collisions of materials in space contribute to the formation of layers in protoplanets?

A
The materials undergo decay when they collide, which results in the heating and subsequent melting and rising of materials.
B
The collisions release heat, which results in the heating and subsequent melting, sinking, and rising of materials.
C
The materials undergo decay when they collide, which results in the cooling and subsequent hardening and sinking of materials.
D
The collisions absorb heat, which results in the cooling and subsequent hardening and rising of materials.
8

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.
9

Which unit of geologic time is the oldest?

A
Cenozoic
B
Mesozoic
C
Ordovician
D
Precambrian
10

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.

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