WorksheetsGeologic Time
Total questions: 20
Worksheet time: 10mins
In general, the law of superposition states that in an
undeformed sequence of sedimentary rocks, each layer is
about the same age.
older than the one above it.
older than the one below it.
thicker than the one above it.
What are fossils?
the oldest layers of rock in a region
objects that people of long ago left behind as artifacts
the remains or traces of an organism preserved from the
geologic past
living creatures with habitats in or around rock
Which of the following environments would NOT
contain fossils?
a thick deposit of dried mud
sediment deposited in a riverbed
layers of sand that accumulated over thousands of years
intrusive rock formed from cooled magma
The principle of fossil succession states that different types
of fossil organisms
succeed one another in a definite order.
occur most often in sedimentary rock.
are older in the deepest layers of rock.
generally leave behind hard parts.
Radioactivity is produced when unstable nuclei
bond.
become cooler.
break apart.
expand.
Which two substances are involved in carbon-14 dating?
carbon-12 and carbon-10
carbon-14 and uranium-238
lead-206 and carbon-14
carbon-14 and carbon-12
The largest expanse of time on the geologic time scale is the
eon..
epoch
era
period
Fossil organisms succeed one another in a definite and determinable order, and any time period can be recognized by its fossil content.
trace fossils
principle of fossil succession
index fossil
petrified fossil
Please identify the type of fossil that you see here.
trace fossil
mold and cast
petrified fossil
unaltered remains
carbon film
Please identify the type of fossil that you see here.
trace fossil
mold and cast
petrified fossil
unaltered remains
carbon film
Please identify the type of fossil that you see here.
trace fossil
mold and cast
petrified fossil
unaltered remains
carbon film
Please identify the type of fossil that you see here.
trace fossil
mold and cast
petrified fossil
unaltered remains
carbon film
Please identify the type of fossil that you see here.
trace fossil
mold and cast
petrified fossil
unaltered remains
carbon film
____________________is the amount of time necessary for one-half of the nuclei in a sample to decay to its stable isotope
half-life
radiocarbon dating
radiometric dating
radioactivity
a principle of relative dating; a rock or fault is younger than any rock or fault through which it cuts
unconformity
principle of original horizontality
principle of cross-cutting relationships
angular unconformity
establishing the equivalence of rocks of similar age in different areas → Correlation
true
false
law that states that in any undeformed sequence of sedimentary rocks, each bed is older that the layers above and younger than the layers below → James Hutton
true
false
fossils of widely distributed organisms that lived during only one short period→ index fossil
true
false
states that organisms change and develop over time to adapt an increase rate of survival→ trace fossil
true
false
smaller time frames found within the division of period→ epoch
true
false
