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LMS Ch 8.2 DR

Determining Absolute Age Directed Reading

QuestionAnswer
A method scientists use to determine absoulute age is?? Using geologic processes that can be observed and measured over time.
Another method of determining absolute age is?? Measuring the chemical composition of certain materials in rock.
Which geologic feature can be given an absolute age using rates of erosion?? Niagara Falls.
Rate of erosion is not a dependable way of determining the absolute age of the Grand Canyon because?? The Grand Canyon formed over millions of years, and rates of erosion may have varied greatly.
Small amounts of what type of materials in rocks can act as natural clocks?? Radioactive Materials.
Atoms of the same element that have different numbers of neutrons are called?? Isotopes.
Radioactive Isotopes emit particles and energy?? At a constant rate regardless of surrounding conditions.
When radioactive isotopes decay?? Particles are emitted, but no energy is released.
In what way is the natural breakdown of radioactive elements most useful to scientists?? It can accurately measure the absolute age of rocks.
The method of using radioactive decay to measure the absolute age of rocks is called?? Radiometric Dating.
What happens when an atom emits particles and energy?? The atom changes into a different isotope of the same element or into an isotope of a different element.
The original radioactive isotope in a rock is called?? The parent isotope.
The method used to determine the age of organic remains included in rock layers is called?? Carbon-14 dating, or radiocarbon dating.
What does most CO2 in the atmosphere contain?? Small amounts of nonradioactive carbon-12 and large amounts of the radioactive isotope carbon-14.
Created by: ericyonggyuhong
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