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GEOLOGIC TIME
Test Description: Geologic time units, how time is divided, index fossils
Instructions: Answer all questions to get your test result.
1) The Geologic Time Scale has been subdivided into a number of time units called periods on the basis of
A
fossil evidence
B
rock types
C
radioactive dating
D
rock thicknesses
2) Why are ancient volcanic ash deposits important to geologists?
A
They form resistant rock layers containing fossils.
B
They are easily dated using carbon-14.
C
They serve as good geologic time markers.
D
They indicate areas where major earthquakes occurred.
3) Approximately what percent of geologic time since the estimated origin of the Earth is represented by the Precambrian Era?
A
50%
B
37%
C
12%
D
87%
4) Which sequence shows the correct order of Earth's geologic time intervals from oldest to youngest?
A
Archean, Proterozoic, Paleozoic, Mesozoic, Cenozoic
B
Archean, Mesozoic, Cenozoic, Paleozoic, Proterozoic
C
Cenozoic, Paleozoic, Archean, Mesozoic, Proterozoic
D
Cenozoic, Mesozoic, Paleozoic, Proterozoic, Archean
5) Which choice lists the units of geologic time in order from largest time unit to smallest?
A
Period, Era, Eon, Epoch
B
Eon, Era, Period, Epoch
C
Era, Period, Eon, Epoch
D
Epoch, Period, Era, Eon
6) Index fossils are important to studying geologic time because
A
They existed for a long time.
B
The are the only fossils from a certain geologic time.
C
They are only found in specific locations.
D
They mark a specific moment in geologic history.
7) A good index fossil must be...
A
Found only in sedimentary rock layers
B
Rarely found within only one rock layer.
C
Found only in one region over a long period of time
D
Found everywhere in a short amount of time.
8) Which epoch is associated with the Last Ice Age to occur in NYS?
A
Pliocene
B
Pleistocene
C
Holocene
D
Eocene
9) Geologists estimate the time of Earth's origin and the entire solar system to be
A
1.6 million year ago
B
13.7 billion years ago
C
65 million years ago
D
4.6 billion years ago
10) What event usually marks the end of one era and the beginning of another?
A
mountain range formation
B
an asteroid strike
C
a volcanic eruption
D
a mass extinction
*select an answer for all questions
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