Fillable High School Explorations Exploration Student Worksheet: Absolute Dating

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High School Explorations Exploration Student Worksheet: Absolute Dating

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High School Explorations
Name __ ______________________ Date ______
____
Worksheet: Absolute Dating © Discovery Communications Inc.
Exploration Student Worksheet: Absolute Dating
Overview
In this Exploration, measure and calculate the parent-daughter ratio of isotopes used to find the
absolute age of geologic samples. Deduce the absolute age of the samples from the
percentage of original parent atoms remaining.
Questions
1. Explain what the half life of a radioactive isotope is and why it is important in absolute
dating.
2. Describe how a mass spectrometer is used for absolute dating.
3. Why is it important to consider the half-life of an isotope, the relative age of the sample, and
the composition of the sample when deciding which isotope to use to date a sample?
High School Explorations
Name ________________________ Date __________
Worksheet: Absolute Dating © Discovery Communications Inc.
4. This exploration is about absolute dating. Yet the feedback on all of the dates says that the
ages are "about" a certain number of years. Why doesn't the feedback state that the age is
exactly a certain number of years?
5. Use this Exploration to identify the best method for dating bones of animals that are only a
few thousand years old. Explain why this is the best choice.
6. Imagine you measure the abundance of parent atoms and daughter atoms in a sample and
find that there are almost the same number of parent as daughter atoms. What does this tell
you about the age of the sample? Explain your answer.
7. Why is it important to have some idea about the relative age of a sample before radiometric
dating?
High School Explorations
Name __ ______________________ Date __________
Worksheet: Absolute Dating © Discovery Communications Inc.
8. Why is it important to be careful interpreting absolute ages of clastic sedimentary rocks such
as sandstones?
9. Identify three assumptions that radiometric dating relies on.
10. Carbon-14 decays to form nitrogen-14. Nitrogen-14, however, is a gas and can therefore
escape from the sample over time. Because of this, we cannot calculate the age of a sample
by measuring the carbon-14 to nitrogen-14 ratio in it. (We use a slightly different method
instead.) If we did use this ratio to calculate the age, how would this calculated age differ
from the actual age? Explain your answer.
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High School Explorations Exploration Student Worksheet: Absolute Dating

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Completed 18 May 2022

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