Geologic Change Over Time
The traces or remains of an organism that lived long ago, most commonly preserved in sedimentary rock.
Fossils
What is relative dating?
Determining whether an object or event is older or younger than other objects or events.
What is absolute dating?
Determining the actual age of an event or object in years
The scientific study of the origin, history, and structure of Earth and the process that shape it.
Geology
Tilting or folding??
Bending of rocks that can happen when rock layers are squeezed together
Folding
A fossilized structure that formed in sedimentary rock by animal activity on or in soft sediment.
A trace fossil
Unconformity
What is half-life?
The time needed for half of a sample of a radioactive substance to undergo radioactive decay to form daughter isotopes
What does the geologic time scale do?
Divides Earth's history into intervals of time defined by major events or changes on Earth.
How are sedimentary rock layers deposited?
In horizontal layers
If you went to a place you have never been for 3 days, could you determine the climate? Why?
No. Climate is the weather conditions over a long period of time.....
What is the law of superposition?
Younger rocks lie above older rocks if the layers have not been disturbed.
You want to determine the age of a sample that contains radioactive isotope that has a half life of 10 years. What type of "dating" would you use?
Radiometric dating
What was the climate of the Cenozoic era?
Cold. Polar ice caps formed.
Todays continents were once part of a landmass called __________________
Pangaea.
What is a sedimentary rock?
A rock made from sediments or other rocks.
An ordered arrangement of rock layers that is based on the relative ages of the rocks, with the oldest rocks at the bottom of the column.
Geologic Column
What is the best type of rock for radiometric dating?
Igneous
One example of Uniformitarism and one example of a catastrophism & WHY
Answers vary
What are older the rocky mountains or the Appalachian mountains?
Appalachian Mountains
Why do scientists dig holes into the ice? What vocab term is this called? what does this tell us about the ice?
To collect a long cylinder of ice called an Ice Core. It can tell us how thick the ice is and the weather condition of the ice.
5 Ways the order or rock layers can be disturbed.... (hint folding is one of them)
Folding, Tilting, fault, intrusion, and unconformity
What happens to an isotope during raidoactive decay? (hint something is in, comes out, and is now replaced with.... )
Neutron is in, electron comes out, replaces with proton
The continents assumed their present positions during what era?
Cenozic Era
What are two ways that scientists can study the Earth's climate history?
Tree rings, sea floor sediment, ice core
(any 2)