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Prentice Hall Earth Science Chapter 12: Geologic Time Flashcards | StudBud
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Prentice Hall Earth Science Chapter 12: Geologic Time
Prentice Hall Earth Science Chapter 12: Geologic Time
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A review that covers the basic points of geologic time.
Flashcards
22 cards
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Practice quiz
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Questions
22
Answers
1
What are periods divided into?
epochs
eras
eons
2
True or False:
Relative dating shows us when something happened, not the sequence of events.
True
False
3
The type of fossil formed is determined by what conditions?
how long the organism was alive
how the organism was buried
how the organism died
when the organism was alive
4
Which of these facts about fossils is
false
?
they show the specifics of an organism
are important components of sediment and sedimentary rocks
they are the remains or traces of prehistoric life
key role in connecting similar aged rocks in seperate places
5
The law of superposition says that in sedimentary rocks, each bed is _____ than the one above.
narrower
wider
younger
older
6
True or False:
If a sedimentary rock has particles, they will be the same age as the rock.
False
True
7
True or False:
When an organism dies, the amount of carbon-14 gradually increases as it decays.
True
False
8
What does uniformitarianism mean?
Earth's layers get more orderly the deeper they are
Earth's layers get more orderly the shallower they are
today's forces and processes have existed for a long time
today's forces and processes have existed for a short time
9
A half-life is the _____ needed for half of the nuclei to decay to its stable isotope.
time
space
fossil matter
sediment
10
By comparing the ratio of carbon-14 to carbon-12 in a sample, _____ can be determined.
radioactivity
radioactive dates
radiocarbon dates
radiometric dates
11
True or False:
A sedimentary rock may have particles with radioactive isotopes.
False
True
12
An accurate radiometric date can be obtained only if the mineral _____ since its formation.
remained a closed system
didn't decay
gained multiple fossils
changed into a different type of rock
13
The age of a particular mineral in a metamorphic rock represents what?
when it first formed
when it was metamorphosed
when it became an open system
when it decayed
14
Geologists have divided Earth's _____ billion year history into specific time units.
4.93
4.02
4.56
4.21
15
The principle of horizontality says _____ layers are usually deposited horizontally.
sediment
volcanic ash
fossil
plant
16
What are eras divided into?
periods
epochs
eons
17
Eons represent the _____ expanses of time.
smallest
greatest
18
What do rocks record?
the exact formation of early rocks
plant life
geological events
changing life forms of the past
19
What are eons divided into?
eras
periods
epochs
20
What have we learned so far about Earth?
it's been changed by geologic processes that happen today
Earth is older than anyone had imagined
it's been changed by processes that no longer happen
Earth is younger than anyone had imagined
21
A(n) _____ is a period when deposition stopped, erosion moved rocks, then deposition resumed.
period
epoch
unconformity
half-life
22
The principle of fossil succession combines the law of superposition and the study of what?
the size of the layers the fossils were in
the rock type each layer is made of
decay levels of the fossil
the fossils the rock layers contain
