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Fossils 2 (ClassScape)
Test Description: 8.E.2.1
Instructions: Answer all questions to get your test result.
1) A geologist found 600-year-old sediments below a particular rock layer. Which will the geologist most likely find above the rock layer?
A
650-year-old sediments
B
450-year-old sediments
C
600-year-old sediments
D
1,000-year-old sediments
2) On a geological dig, two fossil samples were found in different rock layers in the same area. One fossil was found in a rock layer that was located below the other.Which can be concluded about the relative ages of the fossils?
A
The fossil found in the lower layer is younger than the one found above it.
B
The fossils were found in the same area, so they are the exact same age.
C
The fossils are different ages, but it cannot be determined which is older or younger.
D
The fossil found in the lower layer is older than the one found above it.
3) Which best describes a fossil that helps determine the relative age of a rock layer?
A
index fossil
B
unconformity fossil
C
radioactive fossil
D
trace fossil
4) Which characteristic of carbon-14 dating helps scientists determine the approximate time a species became extinct?
A
Carbon-14 decreases at a constant rate over time.
B
Carbon-14 can only be found in fossils of a certain period.
C
Carbon-14 increases at a constant rate over time.
D
Carbon-14 is not present in more recent fossils.
5) Which makes a good index fossil?
A
a fossil that lived throughout geologic time
B
a fossil that lived during three geologic time periods
C
a fossil not commonly found in rocks
D
a fossil that lived during only one geologic time period
6) Which isotope has been most often used to determine the age of fossils in the past 50,000 years?
A
potassium-40
B
argon-40
C
uranium-238
D
carbon-14
7) A rock sample has 25% of its original radioactive element and the half-life of the element is 1 million years. How old is the sample?
A
3 million years old
B
1 million years old
C
500,000 years old
D
2 million years old
8) An undisturbed rock column contains a fossil of a reptile species in the lowest rock layer, an index fossil that was present 1 million years ago in the middle rock layer, and a fossil of a clam species in the top rock layer. Which statement is most l
A
There was a marine habitat over one million years ago that formed rock layers in the column.
B
There was a desert habitat more recently than one million years ago that formed rock layers in the c
C
The index fossil formed when a desert habitat made rock layers in the column.
D
There was a desert habitat before a marine habitat that formed the rock layers in the column.
9) A scientist finds an index fossil in layers of rock in both Africa and South America. What does this indicate about the ages of the rocks?
A
The rocks are younger than the fossils.
B
The rocks are approximately the same age.
C
The African rock is older.
D
The South American rock is older.
10) Which is the most accurate method used in determining the age of a fossil?
A
law of superposition
B
radioactive dating
C
relative dating
D
geologic column
*select an answer for all questions
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