Ch 21 Geologic Time Review
Flashcard
•
Science, Other
•
11th - 12th Grade
•
Hard
Wayground Content
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15 questions
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1.
FLASHCARD QUESTION
Front
What is Geologic Time?
Back
Geologic Time refers to the vast time scale used by geologists and paleontologists to describe the timing and relationships of events in Earth's history.
2.
FLASHCARD QUESTION
Front
What is the principle of superposition?
Back
The principle of superposition states that in undisturbed sedimentary rock layers, the oldest layers are at the bottom and the youngest layers are at the top.
3.
FLASHCARD QUESTION
Front
What is relative dating?
Back
Relative dating is a method used to determine the age of rocks and fossils in relation to one another, without determining their exact age.
4.
FLASHCARD QUESTION
Front
What is absolute dating?
Back
Absolute dating is a method used to determine the exact age of a rock or fossil, often using techniques like radiometric dating.
5.
FLASHCARD QUESTION
Front
What is radiometric dating?
Back
Radiometric dating is a technique used to date materials by comparing the abundance of a radioactive isotope to its decay products.
6.
FLASHCARD QUESTION
Front
What are half-lives?
Back
Half-lives are the time required for half of the radioactive atoms in a sample to decay into a stable form.
7.
FLASHCARD QUESTION
Front
What is an isotope?
Back
Isotopes are variants of a particular chemical element that have the same number of protons but different numbers of neutrons.
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