In what kind of rock can fossils be found?

• Sedimentary Rocks
• Igneous Rocks
• Metamorphic Rocks
• Granite

Which layer formed first?

• Rock Layer W
• Rock Layer X
• Rock Layer Y
• Rock Layer Z

A scientist says that layers Y and M are the same age. How does he know this?

• They are found in the same type of rock.
• They are the lowest layers.
• They have the same type of fossil.
• They are near each other.

Scientists use radioactive decay to measure...

• relative time
• absolute time
• half-lives
• time of day

States that younger rocks lie above older rocks if the layers have not been disturbed

• Law of crosscutting
• Law of superposition
• Relative Dating
• Unconformity

The age of something compared to the age of other things. (Not an exact age) 

• relative age 
• absolute age 
• superposition 
• index 

Imprints of the shells of ocean clams are often found in the rocks of the Appalachian Mountains. What do these imprint fossils most likely indicate?

• These mountains were once under the ocean
• These mountains once had a more rainy climate
• Mountain river clams evolved from ocean clams
• Ocean clams evolved from mountain river clams

Which makes a good index fossil?

• a fossil not commonly found in rocks

• a fossil that lived throughout geologic time

• a fossil that lived during three geologic time periods

• a fossil that lived during only one geologic time period and commonly found on many continents

The diagram shows fossils in different rock layers. Which of these statements about the age of these fossils is most likely correct?

• Fossil A and C are the same age
  
• Fossil B is older than fossil C
• Fossils A is older than fossil B
• Fossil D is older than fossil C

What replaces the wood of a once-living tree to form petrified wood?

• amber
• a cast
• a mold
• minerals