Unit 4: Geologic Time & Dating
Flashcard
•
Science, Other Sciences
•
9th - 12th Grade
•
Practice Problem
•
Hard
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1.
FLASHCARD QUESTION
Front
What is the law of superposition?
Back
The law of superposition states that in undisturbed sedimentary rock layers, the oldest layers are at the bottom and the youngest layers are at the top.
2.
FLASHCARD QUESTION
Front
What is half-life?
Back
Half-life is the length of time required for half of the radioactive atoms in a sample to decay.
3.
FLASHCARD QUESTION
Front
What percent of carbon-14 remains after one half-life?
Back
50% of carbon-14 remains after one half-life.
4.
FLASHCARD QUESTION
Front
How do you determine the relative age of rock layers?
Back
Relative age is determined by comparing the position of rock layers to one another, using principles like the law of superposition.
5.
FLASHCARD QUESTION
Front
What is absolute dating?
Back
Absolute dating is a method used to determine the actual age of a rock or fossil in years.
6.
FLASHCARD QUESTION
Front
What is the difference between relative age and absolute age?
Back
Relative age indicates which rock is older or younger compared to others, while absolute age provides a specific age in years.
7.
FLASHCARD QUESTION
Front
What is an eon in geologic time?
Back
An eon is the largest division of geologic time, lasting hundreds of millions to billions of years.
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