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Earth History
Earth History
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Earth Science review of Earth History
Flashcards
19 cards
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Practice quiz
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Host live
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Questions
19
Answers
1
How many half lives would have gone by if there is 12.5% of the radioactive element remaining?
1
4
3
2
2
What can you use to find the
absolute age
of a rock?
an index fossil
law of superposition
its birth certificate
Answers 1, and 2
3
Does radioactive decay ever completely decay?
Yes
It still unknown to this day.
Depends on the element.
No
4
What is half-life of Uranium-238?
4,500,000,000
5,700
1,300,000,000
49,000,000,000
5
What geologic era is the closest to present day?
Archean
Paleozoic
Mesozoic
Cenozoic
6
Which time period did the Hexameroceras fossil live in? (hint: use the fossil pictures ESRT)
Permian
Jurassic
Silurian
Mesozoic
7
What geologic time period did the earliest fish sprout?
Paleozoic
Permian
Cambrian
Silurian
8
What process connects separated rock layers of the same age and type?
convection currents
age of fossil
correlation
super position
9
What is a correct characteristic for an index fossil?
Widespread in occurrence over a short period of time
Limited amount of the fossil
found in different bedrock over a long period of time
used to date when an element was in existence
10
During what era were there abundant stromatolites?
Paleozoic
Cenozoic
Mesozoic
Proterozoic
11
How many years ago were the dinosaurs alive?
200 million years ago
64 million years.
253 Million years ago.
The dinosaurs are alive.
12
What is a buried erosional surface that separates rocks from different ages called?
unconformity
uplift
fold
fault
13
Rock layers are not overturned and are layered from bottom to top: D,E,C,B, which is oldest?
B
D
E
C
14
Which eon was the longest?
Phanerozoic
Precambrian
15
What is the oldest era?
Proterozoic
Mesozoic
Archean
Cenozoic
16
Which of the following are types of unconformities?
Disconformity
Non-conformity
Angular Unconformity
All of the above
17
In what period is the earliest dinosaur?
Neogene
Jurassic
Triassic
Cretaceous
18
What is the idea that the forces of earth have not changed within time?
Relative dating
The law of superposition
correlation
Uniformitarianism
19
What period did the dinosaurs live in?
Jurassic
Devonian
Neogene
Cambrian
