j ournal #3 – a bsolute d ating 1. divide the following numbers in half a) 100 b) 50 c) 25 d) 12.5...
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JOURNAL #3 – ABSOLUTE DATING
1. Divide the following numbers in halfa) 100 b) 50 c) 25 d) 12.5
2. What were four laws or rules for relative dating?
3. How is relative dating different from absolute dating?
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ABSOLUTE DATINGObjective: Understanding how rocks are given an age based on radioactive elements.
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ABSOLUTE DATINGAbsolute Dating
An actual number of years
When events occurred and organisms lived
Exact age
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UNSTABLE RADIOACTIVE DECAY NUCLEI
Radioactive Decay
All rocks, artifacts and fossils are made up of elements and isotopes
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ISOTOPES• Isotopes: variation of the
same elements with a different number of neutrons
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HALF-LIFEHalf-Life
The time it takes for half of the atoms in an object to decay into another element; Constant and never changes
Radioactive nuclei decay at a known rate which is called their half-life
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HALF-LIFEParent Material – radioactive
isotope
Daughter Product – the result of the radioactive isotope decaying by its half-life
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HALF-LIFERatio of Daughter Products
Used to determine the exact age of rocks, artifacts, and fossils