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Geologic Time Answers

8 verified answers
1
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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.
2
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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
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

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.
5

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
6

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.
7

Which evidence supports the claim that Earth’s continents formed during Precambrian time?

A
Compaction caused rock to cool and rise to form pieces of crust.
B
Earth collided with a large object and threw material onto Earth’s surface.
C
Collisions with comets added land masses to Earth’s surface.
D
Earth’s surface cooled, causing rocks to cool and harden.
8

Which period is older than the Triassic period?

A
Cambrian
B
Cretaceous
C
Jurassic
D
Paleogene
9

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
10

Study this image of a geologic time scale.

Question illustration
A
1.6 million years ago
B
132 million years ago
C
410 million years ago
D
520 million years ago
11

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.
12

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.
13

Which unit of geologic time began 65.5 million years ago and continues to the present?

A
Cenozoic era
B
Mesozoic era
C
Permian period
D
Precambrian time
14

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
15

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.
16

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.
17

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.
18

Which period is older than the Triassic period?

A
Cambrian
B
Cretaceous
C
Jurassic
D
Paleogene

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