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