AnswersMOHEGAN - EARTH SCIENCE AGeologic Time

Geologic Time Answers

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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 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

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
4

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.
5

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
6

What is the purpose of a geological time scale ?

A
It used to predict natural disaters throughout Earth’s history.
B
It is used to present the correct sequence of events in the Earth’s history.
C
It is used to determine the absolute dates in years for different periods.
D
It used to create a naming system for flora and fauna.
7

Which unit of geologic time is the oldest?

A
Cenozoic
B
Mesozoic
C
Ordovician
D
Precambrian
8

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.
9

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
10

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.
11

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.
12

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.
13

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
14

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.
15

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
16

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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