10/10/11 and 10/12/11
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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!)__.