Fossils
Dating Rocks
Dating Rocks II
Dating Rocks III
Relative and Absolute
100
The preserved remains or traces of an organism.
What is a fossil.
100
The age of a rock compared to other rocks.
What is relative age.
100
The method used to determine the absolute age of rocks.
What is absolute dating
100
The time needed for half of a sample of a radioactive substance to undergo radioactive decay
What is Half-life
100
Index Fossil Correlation, Law of Superposition, Cross-Cutting Relationships, Inclusion, and Original Horizontality.
Techniques used in relative dating
200
A hollow imprint that shows the shape of an organism.
What is a mold
200
Useful fossils that help to tell the relative ages of the rocks found in the same area
What are index fossils
200
The breakdown of a radioactive isotope into a stable isotope.
What is radioactive decay
200
Who is the youngest?
What is the fish and reptile
200
Finding a shell fossil in a desert tells us what
What is that it was once underwater
300
An example of this type of fossil would be footprints.
What is a trace fossil.
300
An intrusion is always _________ than the rocks around it.
What is younger.
300
A scientist uses what to find a more precise age of a fossil
What is radioactive dating/Absolute dating
300
What claim can you make about the whale
What is it's older than all other layers because it was deposited first
300
The term or phrase explains why the rock layers typically form parallel to each other.
Original Horizontality
400
A fossil formed when minerals replace all or part of an organism.
What is a petrified fossil.
400
Determining the actual age of an event or object in years.
What is radiometric dating/absolute dating
400
A fault must be _______ than any feature or layer of rock it cuts through
What is younger (most resent)
400
Name 4 things can change the location of rock layers
What is folding, faults, tilts, and intrusions.
400
A sample rock is found to contain 200 grams of a parent isotope. How many grams of the parent isotope will remain after?
100
500
Superposition
A method used to obtain the Relative Age of a rock or fossil.
500
Explain how the Law of Superposition is used to determine the relative ages of sedimentary rock layers.
What is the oldest layer is that the bottom, and each higher layer is younger than the rocks below it.
500
What information does a scientist need to more accurately determine the age of a rock
What is the amount of each radioactive element
500
Where would law of superposition not be useful?
What is an area made of magma or lava
500
Insects become trapped in the sap of ancient trees, and both harden into this type of fossil.
Crystallization