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Evidences For
An Old Earth

By Hannah and Sandy
Layers and Depth of
Sedimentary Rock
Plate Tectonics or Continental
Drift
 Here
Evidences for an old earth
Radiometric Dating
 According  to The American Heritage® Science
 Dictionary radiometric dating is:
     “A method for determining the age of an object based
      on the concentration of a particular radioactive isotope
      contained within it. For inorganic materials, such as
      rocks containing the radioactive isotope rubidium, the
      amount of the isotope in the object is compared to the
      amount of the isotope's decay products (in this case
      strontium). The object's approximate age can then be
      figured out using the known rate of decay of the
      isotope. For organic materials, the comparison is
      between the current ratio of a radioactive isotope to a
      stable isotope of the same element and the known
      ratio of the two isotopes in living organisms.
      Radiocarbon dating is one such type of radiometric
      dating” (“radiometric dating”).   
Carbon 14
 Carbon   14 is the only radioactive isotope
  in organic matter. Half of the Carbon 14
  will have changed to nitrogen 14 in 5,730
  years (Mader 547).
 Carbon 14 dating is a technique to assign
  an actually date to a fossil.
 For example, let’s say that a fossil has one-
  fourth the amount of radioactive 14C as a
  modern sample, then the fossil is
  approximately 11,460 years old (Mader
  547). This is because it is about 2 half-lives
  of 14C.
Radiometric Dating with Fossils
 Because      Carbon 14 has such a short half-
 life, it is useful in archaeology for dating
 artifacts (man-made objects) and the
 bones of animals up to 50,000 to 60,000
 years old (Eschberger). However, it
 cannot be used on anything older than
 50,000 to 60,000 years old.
Radiometric Dating with Fossils
 In order to date older fossils, scientists use
  Potassium-Argon dating. The element
  potassium is found in most rock-forming
  minerals, and the half-life of the
  radioactive isotope Potassium 40 is 1.25
  billion years, allowing measurable
  quantities of Argon 40 to accumulate in
  potassium-bearing minerals of almost all
  ages (Eschberger). The amounts of
  potassium and argon isotopes can be
  measured accurately, making Potassium-
  Argon dating useful for very old rocks.
Works Cited
 Eschberger,     B. "suite101.com ." Dating
  fossils II: Radiometric dating. suite101.com,
  2000. Web. 2 Apr 2012.
  <http://archive.suite101.com/article.cfm/
  paleontology/38275>.
 Mader, Sylvia S. Inquiry into Life. Thirteenth.
  New York: McGraw-Hill, 2011. 547. Print.
 "radiometric dating." The American
  Heritage® Science Dictionary. 2005.
  Houghton Mifflin Company 1 Apr. 2012
  http://
  www.thefreedictionary.com/radiometric+dating

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Evidences for an old earth

  • 1. Evidences For An Old Earth By Hannah and Sandy
  • 2. Layers and Depth of Sedimentary Rock
  • 3. Plate Tectonics or Continental Drift  Here
  • 5. Radiometric Dating  According to The American Heritage® Science Dictionary radiometric dating is:  “A method for determining the age of an object based on the concentration of a particular radioactive isotope contained within it. For inorganic materials, such as rocks containing the radioactive isotope rubidium, the amount of the isotope in the object is compared to the amount of the isotope's decay products (in this case strontium). The object's approximate age can then be figured out using the known rate of decay of the isotope. For organic materials, the comparison is between the current ratio of a radioactive isotope to a stable isotope of the same element and the known ratio of the two isotopes in living organisms. Radiocarbon dating is one such type of radiometric dating” (“radiometric dating”).   
  • 6. Carbon 14  Carbon 14 is the only radioactive isotope in organic matter. Half of the Carbon 14 will have changed to nitrogen 14 in 5,730 years (Mader 547).  Carbon 14 dating is a technique to assign an actually date to a fossil.  For example, let’s say that a fossil has one- fourth the amount of radioactive 14C as a modern sample, then the fossil is approximately 11,460 years old (Mader 547). This is because it is about 2 half-lives of 14C.
  • 7. Radiometric Dating with Fossils  Because Carbon 14 has such a short half- life, it is useful in archaeology for dating artifacts (man-made objects) and the bones of animals up to 50,000 to 60,000 years old (Eschberger). However, it cannot be used on anything older than 50,000 to 60,000 years old.
  • 8. Radiometric Dating with Fossils  In order to date older fossils, scientists use Potassium-Argon dating. The element potassium is found in most rock-forming minerals, and the half-life of the radioactive isotope Potassium 40 is 1.25 billion years, allowing measurable quantities of Argon 40 to accumulate in potassium-bearing minerals of almost all ages (Eschberger). The amounts of potassium and argon isotopes can be measured accurately, making Potassium- Argon dating useful for very old rocks.
  • 9. Works Cited  Eschberger, B. "suite101.com ." Dating fossils II: Radiometric dating. suite101.com, 2000. Web. 2 Apr 2012. <http://archive.suite101.com/article.cfm/ paleontology/38275>.  Mader, Sylvia S. Inquiry into Life. Thirteenth. New York: McGraw-Hill, 2011. 547. Print.  "radiometric dating." The American Heritage® Science Dictionary. 2005. Houghton Mifflin Company 1 Apr. 2012 http:// www.thefreedictionary.com/radiometric+dating