Geology - E.2

The Law of Crosscutting states that a fault or intrusion is __________ than the bodies of rock it cuts through.

• younger
• older
• funnier
• nastier

Which layer is the oldest ?

• A
• E
• D
• F

According to the law of superposition, the oldest fossils are found 

• At the top of the rock layers
• Near the bottom of the rock layers
• In the middle of the rock layers
• Somewhat near the surface

Which best describes radiometric dating?

• using instruments that detect radioactivity to figure out how old something is
• measuring the relative amounts of a radioactive isotope and a daughter product to figure out the age of a sample
• measuring how quickly the different radioactive isotopes in a sample decay to figure out the age of the sample
• using short-wavelength electromagnetic radiation to determine the age of a sample

Which type of dating method can be used on rock layers by applying the Law of Superposition?

• relative dating
• absolute dating
• radioactive dating
• radiometric dating

The length of time required for half of the radioactive atoms in a sample to decay is its...

• era
• age
• half-life
• eon

Scientists use radioactive decay to measure...

• the inferred age
• the actual age
• the pH level
• type of fossil

_______________ is the idea that older rock layers can be found below younger rock layers in undisturbed geologic columns.

• principal of original horizontality
• principal of superposition
• principal of cross-cutting relationships
• principal of unconformities

What makes using radioactive material useful for dating rock layers?

• it is dangerous to be near
• it decays at a constant rate
• sedimentary rock layers don't have radioactive material
• it can only be found in metamorphic rock

What is a Fossil?

• Any dead organism
• The preserved remains or traces of an organism
• A perfect copy of a rock
• None of the above