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Chapter 7 Review
Chapter 7 Review
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Geologic time Pearson 8th grade Earth Science
Flashcards
33 cards
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Practice quiz
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Host live
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Questions
33
Answers
1
Radioactive dating works best with what type of rocks?
sedimentary
metamorphic
igneous
2
the change in living things over time
life cycle
fossil record
extinction
evolution
3
the TIME it takes for half of the radioactive material to break down into a new element
half-life
radiometric dating
radioactive decay
decomposition
4
Scientists know how groups of animals changed over time by studying information in the
preserved remains
geologic time scale
radiometric dating
fossil record
5
a gap in the geologic record where rock layers have been lost due to erosion.
lost data
fossil break
missing link
unconformity
6
the scientist who studies fossils
icthiologist
biologist
Fossologist
paleontologist
7
When the radioactive atoms of one element break down to form another element
radiometric dating
decomposition
radioactive decay
half life
8
Preserved remains or traces of living things
sediment
fossil
fossil record
print
9
What has the study of fossils allowed scientists to do?
study early man
describe past environments and the history of life
understand ancient weather
10
provides evidence of the activities of ancient organisms
cast
trace fossil
carbon film
mold
11
an organism that no longer exists and will never live again on Earth
evolution
death
extinct
endangered
12
when most of the life on Earth is wiped out
Jurassic period
carboniferous period
Pangaea
mass extinction
13
an extremely thin coating of carbon on a rock in the shape of ancient plants or animals.
carbon film
cast
mold
trace fossil
14
the subdivided groups of time in geologic history that each larger group is broken into
eon
epoch
era
period
15
Originally, the geologic time scale placed Earth’s rocks in order by what.
relative age
half life
reverse age
absolute age
16
3 large chunks of time that geologists have broken geologic history into.
era
period
epoch
eon
17
a ball of gas, dust and ice that orbits around the sun
rocket
meteor
cupid
comet
18
The law of superposition helps geologists determine the ______________ age of a rock layer.
exact
absolute
half life
relative
19
when magma pushes into cracks in rock and hardens there without reaching the surface.
intrusive rock
extrusive rock
sedimentary rock
fraggle rock
20
solid copy of the shape of an organism
cast
trace fossil
mold
carbon flim
21
lava that has hardened on the surface and forms igneous rock
fraggle rock
intrusive rock
extrusive rock
fault rock
22
a widely distributed fossil that only existed for a geologically short period
petrified fossil
trace fossil
catalog fossil
index fossil
23
a break in the Earth's crust
fault
break
split
crack
24
The extinction of dinosaurs gave warm-blooded vertebrates called ___a chance to thrive.
fish
reptiles
birds
mammals
25
Geologists use what radioactive element to determine the age of remains such as bone.
sulfur-121
iodine-125
phosphorus-21
carbon-14
26
a record of the geologic events and evolution of life forms in the fossil record
geologic time scale
era
radiometric dating
period
27
a rock's age compared to the age of other rocks.
sedimentary
law of superposition
relative age
absolute age
28
hollow area in sediment in the shape of an organism or part of an organism
carbon film
trace fossil
mold
cast
29
when minerals replace all or part of the organism
carbon film
petrified fossil
trace fossil
mold
30
Fossils usually occur in _______________ rock.
metamorphic
igneous
sedimentary
31
Geologists use radioactive dating to____________
to determine the relative age of rock
to determine what the rock is made of
to determine the color of rock
determine the absolute age of rock
32
the number of years that have past since the rock was formed.
formation
law of superposition
absolute age
relative age
33
in undisturbed sedimentary rock layers, the oldest rock is on the bottom
absolute age
relative age
law of superposition
formation
