DATE: 10/12/11 A/B DayLEQ: 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, Precambrian3. 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).

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

LETS REVIEW!

TIMESCALE:

EON

ERA

PERIODEPOCH

Geologic Time Scale

PRECAMBRIAN TIME

Paleozoic Era

Mesozoic EraCenozoic Era

Chemical and Mechanical Weathering

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

KEY VOCABULARY:

35. EXTINCTION

Activating Strategy

• http://www.spike.com/video-clips/bbbz0b/ice-age-three-melons

STOP AND JOTWhat causes animals to become extinct?

Extinction: when an animal species disappears from earth

________% of all species that have

ever lived on earth have gone extinct!!!

99.9

Extinctions and the geologic timescale:

The geologic timescale is divided by important events, like extinctions (NOT by years!)

Extinction: when an animal species disappears from earth

Before After1. 2. 3. 4. 5.

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.

Mass Extinction Article!

Extinction: when an animal species disappears from earth

Before After1. T2. F3. T4. T5. F

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.

Scientists use rock and fossil evidence

to learn about extinctions from

the past.

Brain Pop: Extinctions

Group Research and Presentations

Use the article provided to make a poster!

Your poster must include:1) a title2) key information from your article3) a brief summary of what you read4) illustrations

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

Learned: Questions:

Group PresentationsIf YOU are presenting…• You are explaining your

poster and the article that your group read to your classmates

• You are explaining KEY POINTS…not just reading from your article!

• You are making eye contact and speaking clearly

If YOU are listening…• You are jotting down key

ideas, facts, and questions you may have for the group

• You are listening respectfully

• You are making sure that you can answer questions about that group’s presentation!

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

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

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!)__.