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Section 21.1 The Geologic Time Scale
Main Idea
Main Ideas
Use with page 554.
(continued)
Details
Label the simplified geologic time scale below. Use Figure 21-1 to
help you. Include the different eons and eras on your time scale. On
the lines to the left and right, write important events about the
appearance and development of different animals.
C RITIQUE
Critique the following statement: “Humans are relatively old
according to the geologic time scale.” Explain whether you agree or disagree. Defend
your answer.
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Section 21.1 The Geologic Time Scale