Relative Dating
Rock Correlation
Absolute Age
Radioactive Decay
100
Looking at the picture below: what is the name of the rock layer that is the oldest
Shale
100
Correlation is a fancy word for what
Matching up
100
What is called when an atom has the same number of protons but a varying amount of neutrons?
Isotope
100
If you wanted to find the age of an organism that is relativity young, which radioactive isotope would you use?
Carbon 14
200
What is the most recent event that took place based on the following picture
Folding
200
How many million years ago did the first mass extinction occur
251
200
What is another name for the Radioactive Isotope and another name for the stable element?
Parent- Isotope
Daughter- Stable Element
200
If you found a bone that had 50% carbon 14 and 50% nitrogen 14, how old would the bone be?
5700 years old
300
A gap in geologic time is referred to as what?
Unconformity
300
During which time period did Hexameroceras and Cytiphyllum both exist?
Silurian
300
How long it takes for a radioactive isotope to decay to half of its original amount is referred to as what?
Half Life
300
How many half lives have passed if you found a rock that contains 6.25% Uranium-238 and 93.75% Lead 206.
4 half lives
400
What type of rock is created as an igneous intrusion comes in contact with the sedimentary rock layers it intrudes?
Metamorphic
400
How old are the oldest fossils found on earth?
542 million years
400
What is the name of line that approaches zero but never gets there called
Asymptotic line
400
If rock started out with 400 g of Potassium 40 but was found with only 25 grams left how old would the rock be?
5.2 x10^9
500
What is the last event that took place, based on the diagram below
Igneous Intrusion of Contact Metamorphism
500
Out of the following types of fossils, which one has been extinct for the longest time? Trilobites, Graptolites, Eurypterids or Placoderm Fish? And how long ago did that type of fossil die?
Placoderm fish, 359 million years ago
500
What percentage of parent will there be after 3 half lives?
12.5%
500
HOw have we determined the age of the Earth
We have found rocks that contain equal amounts of Uranium 238 and Lead 206