AnswersSD-Earth and Space Science A-CRLab: Relative and Absolute Dating

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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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
3

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.
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

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
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

Which period is older than the Triassic period?

A
Cambrian
B
Cretaceous
C
Jurassic
D
Paleogene
9

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
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.
11

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
12

Study the image about geologic time.

Question illustration
A
Quaternary
B
Neogene
C
Paleogene
D
Cenozoic
13

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.
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

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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