What is the half-life of a radioactive element?
HL Geologic Time Mastery Check

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•
Science
•
8th Grade
•
Hard
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1.
FLASHCARD QUESTION
Front
Back
The time it takes for half of the atoms to decay.
2.
FLASHCARD QUESTION
Front
What do scientists study to learn about the history of life and past environments on Earth?
Back
Fossil record.
3.
FLASHCARD QUESTION
Front
In which layer did species C come into existence?
Back
Layer 2 - Because that is the layer it is first seen.
4.
FLASHCARD QUESTION
Front
What is NOT a name of one of the three ERAs on the Geologic Time Scale?
Back
Jurassic.
5.
FLASHCARD QUESTION
Front
How has life evolved starting with the oldest fossils?
Back
Life started in the ocean then slowly evolved through natural selection to life on land. Fish evolved first, then reptiles, then mammals and finally birds.
6.
FLASHCARD QUESTION
Front
What is the Geologic Time Scale?
Back
A system of chronological dating that relates geological strata to time.
7.
FLASHCARD QUESTION
Front
What are the three main ERAs of the Geologic Time Scale?
Back
Paleozoic, Mesozoic, Cenozoic.
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