1. Lesson 086 Read for understanding Make an organizer Use it!
Learning Goal: (You should be able to…)
Describe Earth’s history!
Success Criteria: (Can you …)
Read for understanding
Make an organizer
Use it!
Make a geological ‘clock’!

2. How to organize lesson 085 The lessons Agenda was: W to T Read
Answer questions?
Make a geological ‘clock’!

3. Vocabulary Terms

4. Write to Think 086
CARSON, JAKE, SAMARAH: Finish the geochronology report … get a labtop and do it NOW!
If you did NOT read the informational text yesterday … do so NOW by following the instructions on the lab bench.
Everyone else ….
How is Earth’s geological time split up or divided? What was used to decide when to start each new division?
How many Era are there?
How many Periods are there?
Which one is your favorite period? Why?

5. Use your organizer to … Use your organizer to …
Complete the ‘teacher’ summarizer!
Answer the questions!
ONLY use the informational text once you’ve tried to complete 1 and 2 above to check your work and fill in the gaps and add to your answers!
Use your organizer to …
Complete the ‘teacher’ summarizer!
Answer the questions!
ONLY use the informational text once you’ve tried to complete 1 and 2 above to check your work and fill in the gaps and add to your answers!

6. Divisions of Geologic Time
As geologists studied the fossil record they found major changes in life forms at certain times.
These major changes were used as division points for geologic time.
Geologic Time begins with a long span of time called the Precambrian Time.
Precambrian time covers about 88 % of Earth’s History.
When scientists created the pre-cambrian time label they weren’t aware of much/any? life during this time period…
Turns out they were very wrong.
The time after the pre-cambrian was when life started to flourish on Earth.
Called eras.
The different eras are divided by drastic changes in life forms on Earth.
Paleozoic – “ancient-life” (Fish & Plants)
Mesozoic – “middle-life” (Dinosaurs rule/ Small Mammals)
Cenozoic – “recent-life” (Mammals rule. We are still in this era)

7. Earth’s History/ Geologic Clock Instructions…
To Have Complete by Friday December 9th
Complete calculation data table for section 1 or for all sections….
Color-code (shade in) AND label Era’s in clock.
Fill in the table of life in the top right hand corner (add time).
Fill in boxes around clocks for noteworthy events (add time and description).
Read and annotate informational text about Earth’s Eras.
Complete AND Graphic Organizer about Earth’s Eras.
Finished? Answer summary questions about Geologic Clock.

8. Completing the Calculation Data Table(s)
STEP 1:
Completing the Calculation Data Table(s)
544
1.42
10.58
0.58
34.8
544 MYA
1.42 35 10
:35

9. STEP 2:
Shading in the Eras.
Precambrian Time
= 12 minutes

10. Filling out the life table in the top right hand corner.
Beginning of Earth
& Present Day
STEP 3:
Filling out the life table in the top right hand corner.

11. Completing the boxes around the clock
Beginning of Earth
& Present Day
STEP 4:
Completing the boxes around the clock

12. STEP 6:
Filling out the graphic organizer from your reading and the Timeline Class Set Handout

13. 1. 2. 3. 5. 4. 6.

14. Answer questions in your Lab Notebook.
When did Earth originally form? (How long ago?)
What do scientists study that has allowed them to find major changes in life at certain times in Earth’s history?
How did scientists use these major changes in life when mapping out Earth’s history?
Why is making a clock model useful at helping us conceptualize (understand) Earth’s history?
Why might the Precambrian time have been so long? (Use your answers to questions 3 & 4 to help you).
What are the three eras that followed Precambrian time?
In Greek Paleo means?
In Greek Meso means?
In Greek Ceno means?
THEN Use the information on in the packet to fill out the table. Make sure you color code the heading of each era the same color that is represented on your clock!

15. Divisions of Geologic Time
As geologists studied the fossil record they found major changes in life forms at certain times.
These major changes were used as division points for geologic time.
Geologic Time begins with a long span of time called the Precambrian Time. Precambrian time covers about 88 % of Earth’s History.
The time between the Precambrian time and the present are divided into eras.
Paleozoic – Paleo in Greek means “early or ancient”
Mesozoic – Meso in Greek means “middle”
Cenozoic – Ceno in Greek means “recent”

16. A B C D E F G
Answer
Event in Millions of Years (MYA)
Divide A By Conversion #
Answer to B (hours)
Subtract 12 – C.
Answer to D. (hours). Write the Hours in the Answer Box
Multiply decimal by 60
Answer to F (minutes) Write in minute in the Answer Box
_____ Hours & _____ Minutes
12 – =
Hour & Minutes
4000
4000
10.43
10.43
1.57
0.57
34.2 1
34.2

17. STEP 1: SETTING UP THE CLOCK 12 Beginning of Earth & Present Day 11 110 2 9 3 8 4 7 5 6

18. Becoming familiar with the image about Eras
Open text book to page 128.
Place finger or tip of pencil on the bottom purple of the chart.
This is Precambrian time.
Place finger or tip of pencil on Blue section.
This is Paleozoic Era.
Place finger or tip of pencil on Green section.
This is Mesozoic Era.
Place finger or tip of pencil on Yellow section.
This is Cenozoic Era.

19. Precambrian Time STEP 2: Labeling the Eras 12 Beginning of Earth
& Present Day
STEP 2:
Labeling the Eras 11 1
Precambrian Time 10 2
Precambrian
Time 9 3 8 4 7 5 6

20. Precambrian Time 11:59:58 (2 seconds before 12:00) 11:59 11:01 11:25
11:24
Non-Avian Dinosaurs
11:59:58 (2 seconds before 12:00)
11:59
11:01
11:25
First- Vertebrate Land Animals
10:44
10:07
8:07
10:37
6:30
Cambrian Explosion
1:34
00:11
10:02
Formation of the Moon
Two Snowball Earth’s
1:34
End of the Late Heavy
Bombardment: First Life
Precambrian Time
3:38
Earliest
Start of Photosynthesis
5:59
Atmosphere becomes
oxygen-rich: first snowball Earth

21. End of Lesson