Directed Reading Worksheet 6, Section 5.

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Name _______________________________________________ Date ________________ Class______________
Chapter 6, continued
Using Fossils to Date Rocks (p. 150)
15. When geologists find an index fossil, what information do they
know about the rock layer in which the fossil was found?
16. Imagine that you were rock climbing and found a Phacops fossil.
The rock surrounding this fossil is probably
years old.
Review (p. 150)
Now that you’ve finished Section 4, review what you learned by
answering the Review questions in your ScienceLog.
1. If you found a stack of photographs and wanted to make a model
of a rock sequence, the ––––––––– photographs would be placed
on the top of the stack.
a.
b.
c.
d.
oldest
newest
most accurate and highest resolution
negative
2. Name two things scientists use to study the history of the Earth.
Rock Layers and Geologic Time (p. 151)
3. The layers of sedimentary rock exposed in the Grand Canyon
show more of the geologic column than do most places on Earth.
The exposed layers represent nearly
years of geologic time.
46
HOLT SCIENCE AND TECHNOLOGY
Copyright © by Holt, Rinehart and Winston. All rights reserved.
Section 5: Time Marches On (p. 151)
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Name _______________________________________________ Date ________________ Class______________
CHAPTER 6
Chapter 6, continued
The Geologic Time Scale (p. 152)
4. Why have geologists created the geologic time scale?
▼
▼
▼
Using Figure 22, choose the name in Column B that best matches
the eon described in Column A, and write your answer in the space
provided.
Copyright © by Holt, Rinehart and Winston. All rights reserved.
Column A
Column B
5. Earliest known rocks on Earth
a. Hadean eon
6. Includes the present
b. Archean eon
7. No rocks found on Earth
c. Proterozoic eon
8. First organisms with well-developed cells
d. Phanerozoic eon
Choose the geologic time division in Column B that best matches
the description in Column A, and write your answer in the space
provided.
Column A
Column B
9. third largest division of geologic time
a. era
10. second largest division of geologic time
b. period
11. largest division of geologic time
c. epoch
12. fourth largest division of geologic time
d. eon
13. All of the following are kinds of changes represented by the
boundaries between geologic time intervals except
a.
b.
c.
d.
the appearance or disappearance of life forms.
changes in rock types.
changes in global climate.
changes in the Earth’s position.
14. Life forms appeared on land during the beginning of the
Paleozoic era. True or False? (Circle one.)
DIRECTED READING WORKSHEETS
47
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Name _______________________________________________ Date ________________ Class______________
Chapter 6, continued
15. The Age of Reptiles is the
era.
16. Why is the Cenozoic era called the Age of Mammals?
Can You Imagine 4.6 Billion Years? (p. 155)
17. Look at the Earth-history clock in Figure 26. How long did the
Proterozoic Eon last according to that clock?
18. According to the Earth-history clock in Figure 26, how long has
the Cenozoic era lasted?
650 million years
1 hour
50,000 years
10 minutes
Review (p. 155)
Now that you’ve finished Section 5, review what you learned by
answering the Review questions in your ScienceLog.
48
HOLT SCIENCE AND TECHNOLOGY
Copyright © by Holt, Rinehart and Winston. All rights reserved.
a.
b.
c.
d.
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Lesson
Name _______________________________________________ Date ________________ Class______________
Chapter 6, continued
Using Fossils to Date Rocks (p. 150)
15. When geologists find an index fossil, what information do they
know about the rock layer in which the fossil was found?
Geologists know where the rock layer fits into the geologic column, so they
can give the rock layer an accurate date.
16. Imagine that you were rock climbing and found a Phacops fossil.
The rock surrounding this fossil is probably
400 million
years old.
Review (p. 150)
Now that you’ve finished Section 4, review what you learned by
answering the Review questions in your ScienceLog.
1. If you found a stack of photographs and wanted to make a model
of a rock sequence, the ––––––––– photographs would be placed
on the top of the stack.
a.
b.
c.
d.
oldest
newest
most accurate and highest resolution
negative
2. Name two things scientists use to study the history of the Earth.
Sample answer: Rock layers and the fossils they contain.
Rock Layers and Geologic Time (p. 151)
3. The layers of sedimentary rock exposed in the Grand Canyon
show more of the geologic column than do most places on Earth.
The exposed layers represent nearly
years of geologic time.
46
HOLT SCIENCE AND TECHNOLOGY
2 billion
Copyright © by Holt, Rinehart and Winston. All rights reserved.
Section 5: Time Marches On (p. 151)
Menu
Print
Lesson
Name _______________________________________________ Date ________________ Class______________
CHAPTER 6
Chapter 6, continued
The Geologic Time Scale (p. 152)
4. Why have geologists created the geologic time scale?
Geologists have created the geologic time scale to make it easier to study
the 4.6 billion years of the Earth’s history.
▼
▼
▼
Using Figure 22, choose the name in Column B that best matches
the eon described in Column A, and write your answer in the space
provided.
Copyright © by Holt, Rinehart and Winston. All rights reserved.
Column A
Column B
b
5. Earliest known rocks on Earth
a. Hadean eon
d
6. Includes the present
b. Archean eon
a
7. No rocks found on Earth
c. Proterozoic eon
c
8. First organisms with well-developed cells
d. Phanerozoic eon
Choose the geologic time division in Column B that best matches
the description in Column A, and write your answer in the space
provided.
Column A
Column B
b
9. third largest division of geologic time
a
10. second largest division of geologic time
b. period
d
11. largest division of geologic time
c. epoch
c
12. fourth largest division of geologic time
d. eon
a. era
13. All of the following are kinds of changes represented by the
boundaries between geologic time intervals except
a.
b.
c.
d.
the appearance or disappearance of life forms.
changes in rock types.
changes in global climate.
changes in the Earth’s position.
14. Life forms appeared on land during the beginning of the
Paleozoic era. True or False? (Circle one.)
DIRECTED READING WORKSHEETS
47
Menu
Print
Lesson
Name _______________________________________________ Date ________________ Class______________
Chapter 6, continued
15. The Age of Reptiles is the
Mesozoic
era.
16. Why is the Cenozoic era called the Age of Mammals?
It is called the Age of Mammals because after the mass extinction at the
end of the Mesozoic era, mammals became abundant on Earth.
Can You Imagine 4.6 Billion Years? (p. 155)
17. Look at the Earth-history clock in Figure 26. How long did the
Proterozoic Eon last according to that clock?
The Proterozoic Eon lasted about 5 hours.
18. According to the Earth-history clock in Figure 26, how long has
the Cenozoic era lasted?
650 million years
1 hour
50,000 years
10 minutes
Review (p. 155)
Now that you’ve finished Section 5, review what you learned by
answering the Review questions in your ScienceLog.
48
HOLT SCIENCE AND TECHNOLOGY
Copyright © by Holt, Rinehart and Winston. All rights reserved.
a.
b.
c.
d.

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