DATE: 10/12/11 A/B DayLEQ: What evidence do we use to supportthe extinctions in the geologic timescale?1. List the following in order, from longest to shortest: PERIOD, EPOCH, EON, ERA2. 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).
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 history2. Use evidence to support the causes and effects of extinction on earth3. Describe ways that humans can cause and prevent extinctions
Activating Strategy• http://www.spike.com/video- clips/bbbz0b/ice-age-three-melons STOP AND JOTWhat causes animalsto become extinct?
Extinction: when an animalspecies disappears from earth
99.9 of all ________% species that haveever lived on earthhave gone extinct!!!
Extinctions and the geologic timescale:The geologictimescale isdivided byimportantevents, likeextinctions(NOT by years!)
Extinction: when an animal species disappears from earthBefore After184.108.40.206.5.
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.
Extinction: when an animal species disappears from earthBefore 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 rockand fossil evidence to learn about extinctions from the past.
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 extinction3 ways humans can cause extinction3 things you can do to protect species frombecoming extinct
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 frombecoming 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 aparagraph explaining your opinion about extinctionsin 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 ofspecies by _(list at least 3 ways humans can causeextinction)_.Some ways that we can protect species fromextinction is by _(list at least 3 things you can doto protect species!)__.
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