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Unit 5: Age of the Earth

Relative Dating. In the same way that a history book shows an order of events, layers of rock (called strata) show the sequence of events that took place in the past. Using a few basic principles, scientists can determine the order in which rock layers formed. Once they can know the order, a relative age can be determined for each rock layer.*Relative age indicates that one layer is older or younger than another layer, but does not indicate the rock's age in years (absolute age)..

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Unit 5: Age of the Earth

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    1. Unit 5: Age of the Earth Objective: E5.3D Describe how index fossils can be used to determine time sequence. E5.3g Identify a sequence of geologic events using relative-age dating principles.

    2. Relative Dating Image is from the website: http://highered.mcgraw-hill.com/sites/0078664233/student_view0/unit6/chapter21/section2/self-check_quiz.htmlImage is from the website: http://highered.mcgraw-hill.com/sites/0078664233/student_view0/unit6/chapter21/section2/self-check_quiz.html

    3. Law of Superposition Image is from the website: http://www.sd41.k12.id.us/Staff/MSantos/earth%20sci/Unit%203%20Earth%20History/3%20view/superposition.gifImage is from the website: http://www.sd41.k12.id.us/Staff/MSantos/earth%20sci/Unit%203%20Earth%20History/3%20view/superposition.gif

    4. *Principle of Original Horizontality

    5. Unconformities Image is from the website: http://www.allposters.com/-sp/Erosion-Weathering-Posters_i1025211_.htmImage is from the website: http://www.allposters.com/-sp/Erosion-Weathering-Posters_i1025211_.htm

    6. *Unconformities Image from the website: http://www-rohan.sdsu.edu/~rhmiller/geologictime/GeologicTime.htmImage from the website: http://www-rohan.sdsu.edu/~rhmiller/geologictime/GeologicTime.htm

    7. Crosscutting Relationships Images from the website: http://www-rohan.sdsu.edu/~rhmiller/geologictime/GeologicTime.htmImages from the website: http://www-rohan.sdsu.edu/~rhmiller/geologictime/GeologicTime.htm

    8. Relative Age

    9. *Index Fossils Image is from the website: http://www.dkimages.com/discover/Home/Science/Earth-Sciences/Palaeontology/Fossils/Collecting/Dating/Dating-09.html (left) and http://earthsci.org/fossils/youngp/how2/how1.htm (right)Image is from the website: http://www.dkimages.com/discover/Home/Science/Earth-Sciences/Palaeontology/Fossils/Collecting/Dating/Dating-09.html (left) and http://earthsci.org/fossils/youngp/how2/how1.htm (right)

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