Date
Name
b,s DRuv/
Section 5: Time Marches On (p. 151)
If you found a stack of photographs and wanted to make a modei
photographs would be placed
of a rock sequencer the --on the top of the stack.
a. oldest
b. newest
c. most accurate and highest resolution
d. negative
2. Name two things scientists use to studv the history of the Earth.
I.
Rock Layers and Geologic Time (p. 1s1)
3. The lavers of sedimentary rock exposed in the Grand canyon
sholv more of the geologic column than do most places on Earth.
The exposed layers represent nearly
years of geologic time.
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Date
Name
Class
Chapter 6, continued
The Geologic Time Scale (p. 1s2)
4. Why have geologists created the geologic time scale?
llsins Fisrrre 22. choose the name in Column B that best matches
the eon described in Column A, and write your answer ln the space
provided.
Column,
B
a. Hadean eon
5. Earliest known rocks on Earth
6. Inciudes the present
7. No rocks found on Earth
8. First organisms with well-developed celis
b. Archean eon
c. Proterozoic eor:
d. Phanerozoic eon
Choose the geologic time division in Coiumn B that best matches
the description in Column A, and write your answer in the sPace
provided.
Column
=,;.:;.:-.;,:;i#i
a. era
b. period
c. epoch
d. eon
9. third largest division of geologic time
10. second largest division of geologic time
ll.
B
Iargest division of geologic time
12. fourth largest division of geologic time
13. Ali of the following are kinds of changes represented by the
boundaries between geologic time intervals except
a. the appearance or disappearance of life forms.
b. changes in rock types.
c. changes in global climate.
d. changes in the Earth's Position.
14. Life forms appeared on land during the beginning of the
Paieozoic era. True or False,t (Circle one.)
DIRECTED READINC WORKSHEETS
47
Date
Name
Chapter 6, continued
15. The Age of Reptiles is the
16. Why is the Cenozoic era called the Age of Mammals?
Can You Imagine 4.6 Billion Years? (p. 1ss)
l?. Look at the Earth-history clock in Figure 26. Ir{ow long did the
Proterozoic Eon last according to that clock?
18. According to the Earth-history ciock in Figure 26, hlow long has
the Cenozoic era lasted?
a. 650 million
years
b. t hour
c. 50,000 years
d. 10 minutes
Review (p. lss)
Now that you've finished Section 5, review what you learned by
answering the Review questions in your Sciencelog.
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