Chapter 9 Section 1 ReviewChapter 9 Section 1 ReviewPage 214 #’s 1-8Page 214 #’s 1-8

Directions: Write down the question Directions: Write down the question and the answer for each question on a and the answer for each question on a piece of paper to be included in your piece of paper to be included in your Chapter 9 Notebook.Chapter 9 Notebook.

#1#1

Summarize the reasons that many scientists had to work together to develop the geologic column.

They must work together because different rocks occur all over the world and there is a lot of information to learn .

#2#2Describe the major events in any one

period of geologic time.

Example: During the Devonian Period fish dominated Earth and amphibians first appeared.

(see page 213; the Geologic Time Scale for more)

#3#3

Explain why constructing geologic columns is useful to Earth scientists.

A geologic column is useful because it shows the relative ages of fossils and rocks. (see Figure 1 on page 211 for

example ).

Geologic ColumnsGeologic Columns

#4#4

List the following units of time in order of length from shortest to longest: year, period, era, eon, age, and epoch.

From shortest to longest:

year, age, epoch, period, era, eon

#5#5

Name the three eras of the Phanerozoic Eon, and identify how long each one lasted.

Paleozoic Era: it lasted 291 million yearsMesozoic Era: it lasted 185.5 million yearsCenozoic Era: it has lasted 65.5 million

years so far

#6#6

Compare geologic time with the geologic column.

The geologic column follows geologic time by showing the rocks and fossils that happened during each division of geologic time.

#7#7

When a scientist discovers a new type of fossil, what characteristics of the rock around the fossil would he or she want to learn first?

The first thing a geologist would want to learn is the age of the rock in which the fossil was found.

#8#8

How would our understanding of Earth’s past change if a scientist discovered a mammal fossil from the Paleozoic Era?

It would change our thinking completely because we would have to rethink the entire evolution of animals and the conditions on Earth all the way back to and including the Paleozoic. That is 500 million years of geologic history to rewrite.

The End????The End????