MIDDLE AND HIGH SCHOOL TEACHER MISCONCEPTIONS OF GEOLOGIC TIME
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1 MIDDLE AND HIGH SCHOOL TEACHER MISCONCEPTIONS OF GEOLOGIC TIME Laura Guertin, Penn State Brandywine Peter Licona, Megan Pickard, Pennsylvania State University
2 Previous Work Ê Libarkin et al. (2007): overall, the majority of college students understand the relative order of major biological events in Earth s history, while misunderstanding the time span between events (p. 421) Ê Trend (2001): UK elementary school in-service teachers familiar with the general relative order of biologic events in Earth s history but not the placement of geologic events through time
3 Journal of Geoscience Education, 55(5): November 2007
4 Geologic Time Exercise The following questions address your ideas about time. Please answer to the best of your ability. If you had a time machine and were able to travel back to the moment the Earth was formed, what do you think the Earth would look like? How similar or different would it be from today? Explain your answer. Ê Questions 2-6 ask you to place numbers and words on the timeline of the next page. The words can be in any order on the timeline, and you can put more than one word in the same place. In the space beneath each question, please explain your answers.
5 Geologic Time Exercise How far back in time would you have traveled? Write the number of years next to EARTH FORMS on the timeline on the next page. How many years ago do you think life first appeared on Earth? On the timeline, write FIRST LIFE and the number of years ago when you think life first existed. How many years ago did humans appear on Earth? Write HUMANS and the number of years ago when you think humans first existed. How many years ago did dinosaurs appear on Earth? Write DINO and the number of years ago when you think dinosaurs first existed. Do dinosaurs live today? If so, which dinosaurs? If not, when did dinosaurs stop living? Write NO DINO and the number of years ago on the timeline when you think dinosaurs stopped living. If you went back to the time when dinosaurs were still alive, what do you think the Earth would look like? How similar or different would it be from today? How many years back in time would you have traveled?
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7 Survey Distribution Ê First day of week- long summer workshop on Plate Tectonics Ê 17 Pennsylvania upper elementary, middle and high school teachers
8 Results Ê 16 out of 17 placed the events in the correct order Ê EARTH FORMS: 12 correct Ê FIRST LIFE: 7 correct (btwn 4-3 billion yrs) Ê DINOS APPEAR: 3 correct (btwn million yrs) Ê NO DINOS: 1 correct Ê HUMANS APPEAR: 5 correct
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11 If you had a time machine.. back to when Earth formed look like? Ê Earth would look like a potatoe form space (shaped like one). Ê I would see one joined piece of land with water on either side. Ê I think the Earth would have layers like to does now; however, I think it would have been mostly water. I don t think continents or other land, countries, states, etc., were formed yet. There is more land now then from the start. Ê I base this on things I ve read and movies I ve seen.
12 If you went back in time... back to when dinos were alive Earth look like? Ê Plants were larger and more oxygen in the atmosphere hence some bigger organisms Ê Continents in different places, only one plate Ê Earth was flat with no structures Ê Little water, similar climate to today Ê No pollution, clean air
13 Dinosaurs live today as Ê Alligators, crocodiles, roaches, whales, manatees Ê 7 said dinosaurs not around today Ê Only three mentioned birds
14 Not a Simple Fix! Gooding and Metz, The Science Teacher, April/May 2011, Tips for overcoming student misconceptions (NRC 1997, p. 31) 1) Anticipate most common misconceptions, be alert for others 2) Encourage students to test conceptual frameworks, discuss/think about evidence and possible tests 3) Think about how to address with demonstrations/lab work 4) Revisit misconceptions often 5) Assess and reassess the validity of student concepts
15 Keep the conversation going
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