1. Geological Dating Part II Absolute

4. Once Living things Interpret Evidence Direct Evidence of past Fossils

5. Earth’s history is separated into divisions according to the fossil record: Eons Eras Periods Epochs

7. Absolute Age Dating This method enables scientists to determine the actual age of a rock Radioactive isotopes are found in….

8. Comparing Relative to Absolute (Numerical)

9. Radiometric Dating- Rocks Define Ratio Rate The original radioactive element is called the parent and the new element is called the daughter

11. Rate of decay of a radioactive element in a rock Percent of parent atoms at the 2nd half life is?

13. Radioactive elements with their specific half-life The daughter element of U-238 is? Time for ½ of the U-238 atoms to decay?

15. Half-Life At the end of 1 half- life what is the relationship of daughter to parent material? If 2 rocks were found one containing 2 g of A and the other 4 g of A which rock is older? What percent of the sample is Daughter B at 4 Half-Lives?

16. Clocks in Rocks What is the percent of atoms of the parent and daughter element at a half-life of…? 1, 2 & 5 How can a scientist determine the actual age with this information? Now you are ready to click on: http://www.sciencecourseware.org/VirtualDating/files/1.0_ClocksInRo cks.html http://www.sciencecourseware.org/VirtualDating/files/1.0_ClocksInRo cks.html

17. Coral, Varves, & Tree Growth

18. Radiocarbon Dating - Organisms Carbon C-14 is changed into Nitrogen N-14 during decay of living organisms. Now try this: http://www.sciencecourseware.org/Virtual Dating/files/RC0/RC_0.html

19. Bibliography http://earthsci.org/fossils/geotime/radate/cycle.gif http://www.math.psu.edu/jech/pictures/GrandCanyon/rocks.jpg http://earthobservatory.nasa.gov/Study/Paleoclimatology_CloseUp/paleoclimatology_closeup_2.html www.nps.gov/.../state/tx/1968-7/images/fig26.jpg http://www.calacademy.org/exhibits/california_hotspot/habitat_redwoods.htm http://www.geo.cornell.edu/eas/education/course/descr/EAS302/Timescale.GIFitos.edu/earth -http://www.cerrscience/images/ESCI_110_Lecture_notes_images/Goosenecks.jpghttp://www.cerrscience/images/ESCI_110_Lecture_notes_images/Goosenecks.jpg http://geoinfo.amu.edu.pl/wpk/pe/a/harbbook/c_viii/images/geomorph/Car0140.GIF http://serc.carleton.edu/images/quantskills/methods/PBandJ_175.jpg http://evolution.berkeley.edu/evosite/lines/images/strat_column.gif http://comp.uark.edu/~sboss/seds02.jpg http://www-rohan.sdsu.edu/~rhmiller/geologictime/dikesTexas1.jpg http://www.fas.org/irp/imint/docs/rst/Sect2/correlation.jpg http://www.mhhe.com/earthsci/geology/mcconnell/gti/images/utah.JPG http://www-rohan.sdsu.edu/~rhmiller/geologictime/dikesTexas1.jpg http://www.calstatela.edu/faculty/acolvil/sediment/superposition.jpg http://images.google.com/imgres?imgurl=http://www.winona.edu/geology/MRW/mrwimages/Earth%2520History/metrx_dating.JPG&imgrefurl=http://www.winona.edu/geology/MR W/maps.htm&h=553&w=530&sz=65&hl=en&start=2&tbnid=1fEgWVmmSwDmDM:&tbnh=133&tbnw=127&prev=/images%3Fq%3Dradiometric%2Bdating%2Brocks%26gb v%3D2%26svnum%3D10%26hl%3Den%26client%3Dfirefox-a%26rls%3Dorg.mozilla:en-US:official%26sa%3DG