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EH Investigation 4
Test Description: Geologic time
Instructions: Answer all questions to get your test result.
1) In what era do we live?
A
Paleozoic
B
Mesozoic
C
Precambrian
D
Cenozoic
2) Approximately how old is Earth?
A
3 billion years
B
3 million years
C
4.6 billion years
D
4.6 million years
3) What is the break down of spans of time in Earth history from largest to smallest?
A
Eon, era, period, epoch
B
Epoch, period, era, eaon
C
Period, epoch, era, eon
D
Era, eon, period, epoch
4) Why do scientists study fossils?
A
They provide evidence of organisms.
B
Because they're curious to see past life on Earth.
C
They form in many different ways that interest scientists.
D
They add to our knowledge of the history of life on Earth
5) How do fossils form?
A
A body, or trace, gets left behind. Sediments cover the body or trace and over time become rock, leaving behind an imprint.
B
Sediments cover living organisms and their homes, eventually becoming rock and leaving fossils.
C
Animals get dead and buried and become fossils.
D
Fossils are natures way of letting us know what used to be present on land.
6) Why do some organisms not leave behind fossil imprints?
A
Sediments stop getting made on Earth until the organism has decomposed.
B
They are soft and get eaten before fossilizing.
C
They all get eaten and can't leave anything behind.
D
They can decompose or be eaten instead of leaving parts behind to be preserved in rock.
7) In what types of rock do fossils form?
A
All of these options
B
sedimentary rocks
C
metamorphic rocks
D
igneous rocks
8) What is an index fossil?
A
A fossil that is found across the United States.
B
A fossil that is very clear to identify.
C
A fossil that is a fully complete organism.
D
A fossil that can be used to help date sedimentary rock layers.
9) What characteristics do all index fossils share?
A
wide geographic range, specific size, live only in one place
B
fossils, sedimentary rock, rock colored
C
be able to tell scientists when they formed, be full body, be found with offspring
D
wide geographic range, existed briefly, been abundant, be easy to identify
10) What does the law of fossil succession state?
A
Fossils change over time, no two fossils are alike.
B
Fossils can only be used for dating rock layers.
C
Organisms found as fossils are always identical, fossils cannot be used to date rock layers
D
Organisms found as fossils change over time, fossils can be used to date rock layers
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