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Geologic Time Answers

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1
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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.
2
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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.
3

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.
4

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.
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

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 unit of geologic time is the oldest?

A
Cenozoic
B
Mesozoic
C
Ordovician
D
Precambrian
8

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.
9

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.
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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