View
1.346
Download
0
Category
Tags:
Preview:
DESCRIPTION
Review Questions from class on Tuesday, December 8th.
Citation preview
Review Questions
Chapter 8: Relative Dating, Absolute Dating, Fossils
This principle states that geologic processes are the same today as
they were in the past but the RATES of the processes vary over time
Uniformitarianism
This branch of Earth Science studies the history
of the Earth
Earth Science
What does a Paleontologist study?
Fossils
When you determine whether an object or event is older or
younger than other objects/events, you are finding the object’s ___________ Age.
Relative
This law states that younger rocks lie above
older rocks in undisturbed rock layers.Superposition
A break in the earth’s crust along which blocks of crust
slide relative to one another
Fault
Molten rock from Earth’s interior that squeezes into
existing rock layers and cools
Intrusion
This type of rock disturbance occurs when
rock layers bend and buckle from Earth’s
internal forcesFolding
This disturbance occurs when internal forces in the
earth slant rock layers without folding them
Tilting
Hardened tree sap that sometimes has the
preserved remains of insects
Amber
The number of years an object has existed
Absolute Age
Remains or traces of animals or plants that lived
in past geologic times
Fossils
This occurs when an organism’s tissues are
completely replaced by minerals
Petrification
Any naturally preserved evidence of an animal’s
activity
Trace Fossil
A type of trace fossil that is made from preserved
animal feces or dung & can provide information about the habits/diet of animals
that left themCoprolite
An empty space/cavity in rock where a plant or
animal was buried
Mold
A replica of an object that is created when sediment fills a mold and becomes
rock
Cast
The boundary between a set of tilted rock layers and
a set of horizontal layers
Angular Unconformity
Atoms of the same element that have
different numbers of neutrons
Isotopes
Fossils of organisms that lived during a short, well-defined time span and are only found in rock layers of
a particular geologic ageIndex Fossils
The earth’s age, according to geologists
4.6 Billion years old
The law that states that faults/intrusions are
always younger than the rock layers they cut
throughLaw of Crosscutting
Relationships
Saying one rock is older or younger than another rock
but not saying its age in years
Relative Age
Principle that states that sedimentary rocks left
undisturbed will remain in horizontal layers
Principle of Original Horizontality
A break in the geologic rock record
Unconformity
List 3 methods of absolute dating besides Radiometric
DatingRates of Erosion
Rates of DepositionVarve Count
List two reasons Radiometric Dating is the
most accurate methodDoesn’t depend on
EnvironmentRates don’t vary over time
The original radioactive isotope
Parent Isotope
The newly formed, more stable isotope that forms during radioactive decay
Daughter Isotope
The time it takes for ½ the mass of parent isotope to
decay into its daughter isotopeHalf Life
If you have 16 g of radioactive parent isotope,
how much parent/daughter isotope will you have after 3 half
lives?2 g of Parent
14 g of Daughter
This parent isotope decays into Lead-206, has a half
life of 4.5 billion years, and is used to date rock that is
really old
Uranium 238
This parent isotope decays into Nitrogen-14, has a half
life of 5,730 years, and is used to date rock that is
relatively young
Carbon-14
Sue was found in this state
South Dakota
Sue was the most _______ T.rex ever found
Complete
WHO was Sue the T.rex named after?
The woman who found her
Who bought Sue and for how much?
Chicago’s Field Museum$8 Million
Recommended