1. Lesson 088 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 088 The lessons Agenda was: W to T Read
Re organize on a summarizer
Answer questions?
Make a geological ‘clock’!

3. Vocabulary Terms

4. Write to Think 088 What is the difference between an era and a period?
Why is the first time division soooo long?
What do you think a ‘clock model’ is?
If you drew a ‘clock model’ of Earth’s history, how much time (in hours, minutes, seconds) do you think humans have been in existence?

5. 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 Precambrian time label they weren’t aware of much/any life during this time division…
Turns out they were very wrong!
The time after the Precambrian 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)

6. Earth’s History/ Geologic Clock Instructions…
To Have Complete by Friday December 23rd!
Complete History Clock Model calculation data table for step 1.
Color-code (shade in) AND label Era’s on Clock organizer.
Complete table of life calculation data table for step 2.
Fill in the table of life in the top right hand corner on Clock organizer (add time).
Complete Other Noteworthy events calculation data table for step 3.
Fill in boxes around Clock organizer for noteworthy events (add time and description).
Read and annotate informational text about Earth’s Eras.
Make an organizer
Complete Teachers summarizer about Earth’s Eras.
Use second informational text to add more information.
Answer questions.

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

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

9. 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.

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

11. 1. 2. 3. 5. 4. 6.

12. Where are you up to? START WORKING NOW !
Reading text … see instruction sheet on lab bench #s 1,2,3
Make a organizer of your own choice #4
Use your organizer see second piece of instructions #1
Collect a second informational text and use it to add to your organizer and summarizer
Collect questions and answer them on lined paper second piece of instructions # 2
second piece of instructions # 3 … check your organizer and summarizer .. How good are they!
START WORKING NOW !

13. Answer questions on lined paper.
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!

14. End of Lesson