stud
bud
Sign up
Log in
Home
Library
Explore
SAT
More
Geologic Time Flashcards | StudBud
Explore
/
Geologic Time
Geologic Time
20 terms
·
StudBud Administration
·
2,120 plays
a Quiz! to test students' knowledge of geologic time
Flashcards
20 cards
F
Practice quiz
P
Host live
L
Questions
20
Answers
1
Which fossil is an index fossil?
coral
crinoid
ammonite
crinoid and ammonite
2
According to the graph, what is the half-life of this isotope?
8 billion years
3 billion years
1.5 billion years
4.5 billion years
3
The geologic time scale is a record of
the thickness of sedimentary rock
the rate of fossil formation
formation of Earth's layers
the life forms and geologic events in Earth's history
4
Which event is generally accepted as the cause of the dinosaur extinction that occurred 65 MYA?
asteroid impact
volcanic eruptions
rise in sea temperatures
toxic bacteria
5
During radioactive decay, the number of parent atoms __, while the number of daughter atoms __.
decreases, increases
decreases, decreases
increases, increases
increases, decreases
6
The law of superposition allows us to determine
relative age
radiometric dates
none of these
absolute age
7
Which of the following radioactive substances has the shortest half-life?
C
D
B
A
8
Which of the following objects may be radiocarbon dated?
a 1.5 million year old fish fossil
a 2,500 year old piece of clothing
a 3,500 year old igneous rock
a 75,000 year old freshwater shell
9
A bone has 1/4 the amount of original C-14. The half-life of C-14 = 5,730 years. How old is it?
17,190 years old
5,730 years old
22,920 years old
11,460 years old
10
How many half-lives have passed when the amount of C-14 is 1/4 of the original amount?
3 half-lives
2 half-lives
0 half-lives
1 half-life
11
Which method of correlating rock layers uses volcanic ash?
examining similarities in rock type
examining index fossils
examining mineral composition of the rock
examining key beds
12
Which of the following makes an isotope different from an atom of the same element?
number of neutrons
number of electrons
number of protons
number of nuclei
13
What is the daughter isotope of carbon-14?
argon-40
nitrogen-14
carbon-12
lead-206
14
Which rock layer shown in the diagram is youngest?
B
D
E
C
15
What caused carbon dioxide levels to rise prior to the Permian extinction?
rising ocean temperatures
toxic bacteria
radioactive decay
volcanic eruptions
16
The first evidence of life came BEFORE
formation of the Earth
Permian mass extinction
formation of oceans and continents
fusion within the Sun
17
What was the LAST process to occur in the diagram shown?
the deposition of layer A
the deposition of layer B
the igneous intrusion of D
the formation of fault E
18
What era are we currently in?
Paleozoic
Cenozoic
Mesozoic
Precambrian
19
A rock that has become included in another body of sediment must be __ than the sediment
the same age
no age relationship
younger
older
20
In order to be considered an index fossil, a fossil must be...
widespread
short-lived
all of these
easily recognizable
