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How do geologists determine the age of rocks or other unknown objects found on earth?
How do we know that the earth is 4.6 billion years old?
What is the difference between absolute and relative?
Enduring Understandings:
Relative dating is a qualitative measurement and does not give an exact age of an object, it is sometimes based on the geological concept of superposition.
The geological law of superposition tells us that old "things" are buried deeper in earth's crust than new "things."
Absolute dating is a quantitative measurement and it is based on the natural radioactivity of elements contained in rocks and fossils.
Absolute dating is based on comparing the ratio of a naturally occurring radioactive isotope and its decay products, using a known decay rate called "half-life."
Textbook Connection:
Relative Dating read Chapter 17.1 in Modern Earth Science
Absolute (Radiometeric) Dating read Chapter 17.2 in Modern Earth Science
The Chemistry of the Earth Chapter 8.1 and Chapter 8.2
The Basic Principles of Geology (also a book by Charles Lyell)
Principle of Original Horizontality
Law of Superposition
Principle of Lateral Continuity
Principle of Cross-cutting
Principle of Faunal Succession
GeoSleuth (In Class "Murder" Mystery Lesson) Powerpoint Presentation
A little off topic.. Have you ever heard of Schrodinger's Cat?
...if you were thinking, "That radioactive material must have undergone beta decay since it was emitting an electron, then, well, you're very observant!"
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