Lesson 3 Reading Guide - KC This principle states that sedimentary layers are originally laid down...
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Transcript of Lesson 3 Reading Guide - KC This principle states that sedimentary layers are originally laid down...
![Page 1: Lesson 3 Reading Guide - KC This principle states that sedimentary layers are originally laid down horizontally. STARTER Relative-Age Dating.](https://reader035.fdocuments.net/reader035/viewer/2022070306/5518bc6c55034638098b4734/html5/thumbnails/1.jpg)
• This principle states that sedimentary layers are originally laid down horizontally.
STARTER
Relative-Age Dating
![Page 2: Lesson 3 Reading Guide - KC This principle states that sedimentary layers are originally laid down horizontally. STARTER Relative-Age Dating.](https://reader035.fdocuments.net/reader035/viewer/2022070306/5518bc6c55034638098b4734/html5/thumbnails/2.jpg)
• absolute age
• isotope
• radioactive decay
• half-life
Absolute-Age Dating
![Page 3: Lesson 3 Reading Guide - KC This principle states that sedimentary layers are originally laid down horizontally. STARTER Relative-Age Dating.](https://reader035.fdocuments.net/reader035/viewer/2022070306/5518bc6c55034638098b4734/html5/thumbnails/3.jpg)
• Scientists use the term absolute age to mean the numerical age, in years, of a rock or object.
Absolute Ages of Rocks
• Scientists have been able to determine the absolute ages of rocks and other objects since the beginning of the twentieth century, when radioactivity was discovered.
• Radioactivity is the release of energy from unstable atoms.
![Page 4: Lesson 3 Reading Guide - KC This principle states that sedimentary layers are originally laid down horizontally. STARTER Relative-Age Dating.](https://reader035.fdocuments.net/reader035/viewer/2022070306/5518bc6c55034638098b4734/html5/thumbnails/4.jpg)
Absolute Ages of Rocks (cont.)
How is absolute age different from relative age?
![Page 6: Lesson 3 Reading Guide - KC This principle states that sedimentary layers are originally laid down horizontally. STARTER Relative-Age Dating.](https://reader035.fdocuments.net/reader035/viewer/2022070306/5518bc6c55034638098b4734/html5/thumbnails/6.jpg)
• Isotopes are atoms of the same element that have different numbers of neutrons.
• Stable isotopes do not change under normal conditions.
Atoms
![Page 7: Lesson 3 Reading Guide - KC This principle states that sedimentary layers are originally laid down horizontally. STARTER Relative-Age Dating.](https://reader035.fdocuments.net/reader035/viewer/2022070306/5518bc6c55034638098b4734/html5/thumbnails/7.jpg)
Radioactive decay is the process by which an unstable element naturally changes into another element that is stable.
![Page 8: Lesson 3 Reading Guide - KC This principle states that sedimentary layers are originally laid down horizontally. STARTER Relative-Age Dating.](https://reader035.fdocuments.net/reader035/viewer/2022070306/5518bc6c55034638098b4734/html5/thumbnails/8.jpg)
• The rate of decay is constant for a given isotope and measured in time units called half-lives.
• An isotope’s half-life is the time required for half of the parent isotopes to decay into daughter isotopes.
• Half-lives of radioactive isotopes range from a few microseconds to billions of years.
Atoms (cont.)
![Page 10: Lesson 3 Reading Guide - KC This principle states that sedimentary layers are originally laid down horizontally. STARTER Relative-Age Dating.](https://reader035.fdocuments.net/reader035/viewer/2022070306/5518bc6c55034638098b4734/html5/thumbnails/10.jpg)
• Because radioactive isotopes decay at a constant rate, they can be used to measure the age of the material that contains them.
• Radiometric dating is the process in which scientists measure the ratio of the amount of parent isotope to daughter product in a sample of the material they want to date.
Radiometric Ages
![Page 12: Lesson 3 Reading Guide - KC This principle states that sedimentary layers are originally laid down horizontally. STARTER Relative-Age Dating.](https://reader035.fdocuments.net/reader035/viewer/2022070306/5518bc6c55034638098b4734/html5/thumbnails/12.jpg)
Homework:
Read pg. 344-350 and complete worksheet
Extra Credit:
Ancient Mysteries and Carbon-14 Dating
![Page 13: Lesson 3 Reading Guide - KC This principle states that sedimentary layers are originally laid down horizontally. STARTER Relative-Age Dating.](https://reader035.fdocuments.net/reader035/viewer/2022070306/5518bc6c55034638098b4734/html5/thumbnails/13.jpg)
• Absolute age is the age in years of a rock or object.
• The radioactive decay of unstable isotopes occurs at a constant rate, measured as half-life.
• To date a rock or object, scientists measure the ratios of its parent and daughter isotopes.
Lesson 3: Absolute-Age Dating
![Page 14: Lesson 3 Reading Guide - KC This principle states that sedimentary layers are originally laid down horizontally. STARTER Relative-Age Dating.](https://reader035.fdocuments.net/reader035/viewer/2022070306/5518bc6c55034638098b4734/html5/thumbnails/14.jpg)
A. an isotope
B. a neutron
C. a stable element
D. a proton
Radioactive decay is the process by which an unstable element naturally changes into which of these?
![Page 15: Lesson 3 Reading Guide - KC This principle states that sedimentary layers are originally laid down horizontally. STARTER Relative-Age Dating.](https://reader035.fdocuments.net/reader035/viewer/2022070306/5518bc6c55034638098b4734/html5/thumbnails/15.jpg)
A. age
B. radiometric date
C. rate of decay
D. half-life
Which of these refers to the time required for half of the parent isotopes to decay into daughter isotopes?
![Page 16: Lesson 3 Reading Guide - KC This principle states that sedimentary layers are originally laid down horizontally. STARTER Relative-Age Dating.](https://reader035.fdocuments.net/reader035/viewer/2022070306/5518bc6c55034638098b4734/html5/thumbnails/16.jpg)
A. neutrons
B. atoms
C. protons
D. parent isotopes
Isotopes are atoms of the same element that have different numbers of what?