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Geologic Time
Geologic Time
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a Quiz! to test students' knowledge of geologic time
Flashcards
16 cards
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Practice quiz
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Questions
16
Answers
1
Which of the following radioactive substances has the shortest half-life?
A
B
D
C
2
What type of unconformity is shown?
nonconformity
angular unconformity
disconformity
tilting
3
Which event is generally accepted as the cause of the dinosaur extinction that occurred 65 MYA?
asteroid impact
toxic bacteria
rise in sea temperatures
volcanic eruptions
4
During radioactive decay, the number of parent atoms __, while the number of daughter atoms __.
decreases, increases
decreases, decreases
increases, increases
increases, decreases
5
In order to be considered an index fossil, a fossil must be...
widespread
easily recognizable
all of these
short-lived
6
How old is the Earth?
4.6 billion years
3 billion years
8.2 billion years
1.5 billion years
7
What type of fossil is shown in the image?
Petrified
Carbon Film
Trace
Preserved
8
What law that states that the youngest rocks are found on top and oldest on the bottom?
inclusions
original horizontality
crosscutting
superposition
9
What era and period are we currently in?
Mesozoic; Jurassic
Precambrian; Cambrian
Cenozoic; Quaternary
Paleozoic; Devonian
10
Which rock layer shown in the diagram is oldest?
D
E
C
B
11
Observe the red and blue box, how many half lives have occurred for a 1:7 ratio?
7
4
5
3
12
How many half lives of this isotope have passed if there are 20,000 atoms left?
6
8
1
4
13
The geologic time scale is a record of
formation of Earth's layers
the life forms and geologic events in Earth's history
the thickness of sedimentary rock
the rate of fossil formation
14
Which of the following Periods did not end with a mass extinction?
Cretaceous
Permian
Precambrian
Cambrian
15
A rock that has become included in another body of sediment must be __ than the sediment
no age relationship
the same age
younger
older
16
What was the LAST process to occur in the diagram shown?
the deposition of layer A
the igneous intrusion of D
the deposition of layer B
the formation of fault E
