Fossils & Extinction
Flashcard
•
Science
•
8th Grade
•
Practice Problem
•
Hard
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10 questions
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1.
FLASHCARD QUESTION
Front
How do we know when ichthyosaurs became extinct?
Back
After a certain point in the fossil record, no ichthyosaur fossils are found.
2.
FLASHCARD QUESTION
Front
During which period did icthyosaurs become extinct?
Back
tertiary
3.
FLASHCARD QUESTION
Front
During which period did ichthyosaurs first appear?
Back
triassic
4.
FLASHCARD QUESTION
Front
Many parts of the world show a layer of iridium, a common element in asteroids, in rocks dating back 65 million years. What do scientists infer from this?
Back
This iridium layer suggests there was an asteroid impact.
5.
FLASHCARD QUESTION
Front
Which statement is true?
- Trilobites are the youngest fossils shown.
- Ferns are older than ammonites.
- Ammonites are older than ferns.
Back
Ammonites are older than ferns.
6.
FLASHCARD QUESTION
Front
What is this a picture of? Options: layers of Earth, periods of time, a pretty cool fossil collection, the fossil record
Back
the fossil record
7.
FLASHCARD QUESTION
Front
After which layer was there a mass extinction? Options: after the blue layer, after the green layer, after the yellow layer, after the red layer
Back
after the yellow layer
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