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