1. DATE: 10/12/11 A/B Day
LEQ: What evidence do we use to support
the extinctions in the geologic timescale?
1. List the following in order, from longest to shortest:
PERIOD, EPOCH, EON, ERA
2. List the following, from earliest to latest (most recent)
Cenozoic, Paleozoic, Mesozoic, Precambrian
3. What is the geologic timescale?
4. Copy and complete the following sentence:
Scientists divide the geologic timescale
based on (a certain number of
years/important events in earth’s history).

2. TRACK YOUR PROGRESS: Unit 1 Quiz C
-1 = 95 -8 = 60 -15 = 25
-2 = 90 -9 = 55 -16 = 20
-3 = 85 -10 = 50 -17 = 15
-4 = 80 -11 = 45 -18 = 10
-5 = 75 -12 = 40 -19 = 5
-6 = 70 -13 = 35
-7 = 65 -14 = 30

3. LETS REVIEW!

4. TIMESCALE:
EON
ERA
PERIOD
EPOCH

5. Geologic Time Scale
PRECAMBRIAN TIME
Paleozoic Era
Mesozoic Era
Cenozoic Era

6. Chemical and Mechanical Weathering

7. Today’s LEQ: What evidence do we use
to support the extinctions in the
geologic timescale?
By the end of today, you should be able to…
1. Describe the two greatest extinctions in the geologic
history
2. Use evidence to support the causes and effects of
extinction on earth
3. Describe ways that humans can cause and prevent
extinctions

8. KEY VOCABULARY:
35. EXTINCTION

9. Activating Strategy
• http://www.spike.com/video-
clips/bbbz0b/ice-age-three-melons
STOP AND JOT
What causes animals
to become extinct?

10. Extinction: when an animal
species disappears from earth

11. 99.9 of all
________%
species that have
ever lived on earth
have gone extinct!!!

12. Extinctions and the geologic timescale:
The geologic
timescale is
divided by
important
events, like
extinctions
(NOT by years!)

13. Extinction: when an animal species
disappears from earth
Before After
1.
2.
3.
4.
5.

14. Anticipation Guide: TRUE OR FALSE?
1. 50% of the earth’s species have gone extinct.
2. Mass extinctions make it impossible for new life to
live on earth.
3. Volcanic eruptions and large asteroids or comets
are most likely the causes of extinction in many
cases.
4. A flood is most closely linked to the extinction of
the dinosaurs.
5. Today, many scientists think the evidence
indicates a sixth mass extinction is under way.

15. Mass Extinction Article!

16. Extinction: when an animal species
disappears from earth
Before After
1. T
2. F
3. T
4. T
5. F

17. Let’s Check: TRUE OR FALSE?
1. 50% of the earth’s species have gone extinct.
2. Mass extinctions make it impossible for new life to
live on earth.
3. Volcanic eruptions and large asteroids or comets
are most likely the causes of extinction in many
cases.
4. A flood is most closely linked to the extinction of
the dinosaurs.
5. Today, many scientists think the evidence
indicates a sixth mass extinction is under way.

18. Scientists use rock
and fossil evidence
to learn about
extinctions from
the past.

19. Brain Pop: Extinctions

20. Group Research and Presentations
Use the article provided
to make a poster!
Your poster must include:
1) a title
2) key information from your article
3) a brief summary of what you read
4) illustrations

21. Summarizer: WHAT TO LISTEN FOR!!!!!!
3 causes of extinction
3 ways humans can cause extinction
3 things you can do to protect species from
becoming extinct

22. Learned: Questions:

23. Group Presentations
If YOU are presenting… If YOU are listening…
• You are jotting down key
• You are explaining your
ideas, facts, and questions
poster and the article that
you may have for the group
your group read to your
classmates • You are listening
respectfully
• You are explaining KEY
POINTS…not just reading • You are making sure that
from your article! you can answer questions
• You are making eye contact about that group’s
presentation!
and speaking clearly
THINGS TO LISTEN FOR!
-3 causes of extinction
-3 ways humans can cause extinction
-3 things you can do to protect species from
becoming extinct

24. Who Can Tell Me…
• …How the dinosaurs became extinct
• Watch this clip. As you watch, fill in
the blank below:
– The dinosaurs became extinct
because _______________________
______________________________
______________________________
__.
• http://www.youtube.com/watch?v=
y4COsg8o02Q

25. Summarizer: Use the following template to write a
paragraph explaining your opinion about extinctions
in the past and the future:
Extinctions can be caused by many things,
including _(list at least 3 causes of extinction)_.
Humans can contribute to the extinction of
species by _(list at least 3 ways humans can cause
extinction)_.
Some ways that we can protect species from
extinction is by _(list at least 3 things you can do
to protect species!)__.