Relative and Absolute Dating
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Objective
I can compare and contrast relative and absolute dating methods used to determine the age of rocks and fossils.
Part 1 of 4
Warm-up video
Professor Dave Explains · 6:21Vetted channel
We don't generate video — this one is by Professor Dave Explains on YouTube. The practice questions and exit ticket below were drafted by AI for this objective, and every question is editable in the teacher guide.
Part 2 of 4
Key concepts
3 concepts
- 1
Relative dating compares the age of formations based on their stratigraphic sequence, while absolute dating uses the decay of radioisotopes to calculate a rock’s precise age. (Word Bank: Relative dating, absolute dating, superposition, cross-cutting)
- 2
The principle of original horizontality states that sediments accumulate in horizontal layers, and the principle of superposition states that beds on the bottom are usually older than beds on top, unless tectonic forces have overturned the outcrop. (Word Bank: original horizontality, superposition, inclusions, unconformities)
- 3
An unconformity represents missing time in the rock record due to erosion or nondeposition, and can be classified as a disconformity, paraconformity, nonconformity, or angular unconformity. (Word Bank: unconformity, angular unconformity, faunal succession, cross-cutting)
Part 3 of 4
Practice
12 questions
What is the primary difference between relative and absolute dating methods?
Which dating method was used before the advent of radiometric dating?
Part 4 of 4
Exit ticket
Quick comprehension check
“Briefly describe the key differences between relative dating and absolute (radiometric) dating in determining the age of rocks. Provide one example of a principle used in relative dating.”
Sample answer included in the free materials
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