Geologic Time Scale
Flashcard
•
Science
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7th Grade
•
Practice Problem
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Medium
Wayground Content
Used 2+ times
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15 questions
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1.
FLASHCARD QUESTION
Front
What is the Geologic Time Scale?
Back
A system of chronological dating that relates geological strata to time, used by geologists and other Earth scientists to describe the timing and relationships of events in Earth's history.
2.
FLASHCARD QUESTION
Front
What is relative age dating?
Back
A method used to determine the age of rocks and fossils in relation to one another, without determining their exact age.
3.
FLASHCARD QUESTION
Front
What does the Law of Superposition state?
Back
In an undeformed sequence of sedimentary rocks, the oldest layers are at the bottom and the youngest layers are at the top.
4.
FLASHCARD QUESTION
Front
What is an index fossil?
Back
A fossil that is used to define and identify a particular time period in the geologic time scale, typically widespread and existed for a short duration.
5.
FLASHCARD QUESTION
Front
Why is fossil 3 not a good index fossil?
Back
It is found in multiple layers of the same outcrop, which makes it difficult to determine a specific time period.
6.
FLASHCARD QUESTION
Front
Approximately how long ago did Earth form?
Back
About 4.6 billion years ago (4.6 bya).
7.
FLASHCARD QUESTION
Front
What is the significance of the Law of Superposition in geology?
Back
It helps geologists determine the relative ages of rock layers and the fossils within them.
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