Radioactive Decay
What is the decay product of Rubidium-87?
Strontium-87
In an undisturbed outcrop, what layer would you expect to find the oldest rock?
The bottom layer
What plate boundary is moving towards each other
Convergent
How long ago did the Earth and the Solar System form?
4.6 billion years ago
How long ago did the Columnaria live?
450-470 million years ago
What is the time it takes for one half-life to occur for Uranium-235?
713 Million years
The geologic processes that happen in the present most likely happened in the past.
Uniformitarianism
What type of plate boundary can be found in the middle of the Atlantic Ocean
Divergent
During what period did the first horses and whales appear?
Paleogene
Were any Isotelus alive when the nautiloid cephalopods were alive?
No
What is the best Isotope to use to date a rock that is 1 million years old?
Potassium-40
What does the Law of Superposition say?
The oldest layer is on the bottom, the youngest is on the top
Is oceanic or continental crust more dense?
Oceanic Crust
Mississippian
Did the Iocrinus exist before or after the earliest dinosaurs?
Before
Would you be able to use Carbon-14 to determine the age of an Eurypterid? Why or why not?
No, it's older than 70,000 years old.
On a diagram, how can you tell the difference between an igneous intrusion and an igneous extrusion
Intrusion has contact metamorphism on top; extrusion does not have contact metamorphism on the top
What plate is subducting underneath the overriding plate at the Aleutian Trench?
Pacific Plate
During what Eon was there oxygen in the ocean?
Archean
What fossil existed the closest to when humans exist (Give me the letter)
AA or BB
If a rock has gone through 4 half lives of Uranium-238, how old is the rock and how much percentage of U-238 is left?
18 billion years old, 6.25 percent
What would cause the law of superposition to not be correct
Tilting, Folding, or Igneous Intrusion
What plate boundary is associated with Ocean Trenches and Volcanic Mountains
Convergent
What fossil group has been around for the longest amount of time?
Stromatolites
Two qualities of index fossils are:
Wide geographic location and a short period of time