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Geologic Time
Geologic Time
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a Quiz! to test students' knowledge of geologic time
Flashcards
20 cards
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Questions
20
Answers
1
What era are we currently in?
Mesozoic
Paleozoic
Precambrian
Cenozoic
2
In order to be considered an index fossil, a fossil must be...
all of these
easily recognizable
widespread
short-lived
3
The first evidence of life came BEFORE
formation of oceans and continents
formation of the Earth
Permian mass extinction
fusion within the Sun
4
During radioactive decay, the number of parent atoms __, while the number of daughter atoms __.
increases, increases
increases, decreases
decreases, decreases
decreases, increases
5
A rock that has become included in another body of sediment must be __ than the sediment
older
the same age
younger
no age relationship
6
The law of superposition allows us to determine
none of these
absolute age
radiometric dates
relative age
7
What caused carbon dioxide levels to rise prior to the Permian extinction?
toxic bacteria
volcanic eruptions
rising ocean temperatures
radioactive decay
8
Which method of correlating rock layers uses volcanic ash?
examining index fossils
examining key beds
examining similarities in rock type
examining mineral composition of the rock
9
Which of the following objects may be radiocarbon dated?
a 75,000 year old freshwater shell
a 1.5 million year old fish fossil
a 2,500 year old piece of clothing
a 3,500 year old igneous rock
10
Which of the following makes an isotope different from an atom of the same element?
number of electrons
number of protons
number of neutrons
number of nuclei
11
How many half-lives have passed when the amount of C-14 is 1/4 of the original amount?
0 half-lives
1 half-life
2 half-lives
3 half-lives
12
The geologic time scale is a record of
the thickness of sedimentary rock
the life forms and geologic events in Earth's history
the rate of fossil formation
formation of Earth's layers
13
What is the daughter isotope of carbon-14?
nitrogen-14
lead-206
carbon-12
argon-40
14
Which of the following radioactive substances has the shortest half-life?
B
D
C
A
15
Which rock layer shown in the diagram is youngest?
B
D
E
C
16
According to the graph, what is the half-life of this isotope?
8 billion years
3 billion years
4.5 billion years
1.5 billion years
17
A bone has 1/4 the amount of original C-14. The half-life of C-14 = 5,730 years. How old is it?
5,730 years old
17,190 years old
11,460 years old
22,920 years old
18
What was the LAST process to occur in the diagram shown?
the igneous intrusion of D
the formation of fault E
the deposition of layer A
the deposition of layer B
19
Which fossil is an index fossil?
coral
ammonite
crinoid
crinoid and ammonite
20
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
