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Diagrams for relative dating

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As sediment weathers and erodes from its source, and as long as it is does not encounter any physical barriers to its movement, the sediment will be deposited in all directions until it thins or fades into a different sediment type.

This concept known as the Principle of Lateral Continuity allows us to assume that similar layers of rock or sediment that are separated by a valley or other erosional feature were once continuos.

It is estimated to require four hours of class time, including approximately one hour total of occasional instruction and explanation from the teacher and two hours of group (team) and individual activities by the students, plus one hour of discussion among students within the working groups.

Explore this link for additional information on the topics covered in this lesson: This activity will help students to have a better understanding of the basic principles used to determine the age of rocks and fossils. Objectives of this activity are: 1) To have students determine relative age of a geologically complex area.

For purposes of relative dating this principle is used to identify faults and erosional features within the rock record.

Then, by applying the Principle of Cross-Cutting we are able to relatively date those processes.

This can be done with a degree of ease for the first 20 elements following several simple steps."You'll see the explosion reflected off the moon." The graphics immediately above and below are from a Feb 09 PDF (3 meg) from Argonne Labs. Widespread multiple failures would take longer to repair."NEW MADRID really scares me," said Jim Wilkinson, director of the Memphis- Central United States Earthquake Consortium, ( ) an eight-state emergency preparedness group.It wasn't until well into the 20th century that enough information had accumulated about the rate of radioactive decay that the age of rocks and fossils in number of years could be determined through radiometric age dating.This activity on determining age of rocks and fossils is intended for 8th or 9th grade students."They carry gas all the way to Detroit, Chicago, Indianapolis and Pittsburgh.