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Geologic History Review
Test Description: Material covered on the Unit 4: Geologic History test.
Instructions: Answer all questions to get your test result.
1) A good index fossil will be
A
short lived and found in many locations
B
long lived and found in one location
C
short lived and found in one location
D
long lived and found in many locations
2) Earth is
A
4600 million years old
B
all of the above are the same number
C
4.6 x 10^9 years old
D
4.6 billion years old
3) Radioactive isotopes are used to date rocks and fossils because
A
They decay at a predictable rate
B
They last a long time
C
They don't break down over time
D
They are easy to find
4) Carbon-14 is a good isotope to use to date fossils and rocks that are
A
millions of years old
B
less than 50,000 years old
C
not from Earth
D
billions of years old
5) A sample containing 25% Potassium-40 and 75% Argon-40 has gone through
A
4 half-lives
B
1 half-life
C
2 half-lives
D
3 half-lives
6) Most of the rocks found in Western New York are from the geologic time period know as
A
Cambrian
B
Triassic
C
Permian
D
Devonian
7) Earth's current atmosphere
A
has no oxygen
B
has no nitrogen
C
is the same as it was 4.6 billion years ago
D
evolved from oxygen producing bacteria 3 billion years ago
8) When a radioactive isotope decays
A
it is released to space
B
it turns into a new element
C
it stays the same element
D
it disappears
9) When examining layers of rocks, the oldest layer can be found
A
second from the bottom
B
at the top
C
on the bottom
D
in the middle
10) A fault, folding, tilting, intrusions or extrusions are
A
younger than the layers they cut
B
older than the layers they cut
C
the same age as the layers they cut
D
due to weathering and erosion
11) An unconformity is
A
missing layers due to intrusions
B
missing layers due to weathering and erosion
C
a fault
D
a terrible storm
*select an answer for all questions
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