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A sample containing 25% Potassium-40 and 75% Argon-40 has gone through
younger than the layers they cut
2 half-lives
They decay at a predictable rate
it turns into a new element
Devonian
on the bottom
short lived and found in many locations
all of the above are the same number
When a radioactive isotope decays
younger than the layers they cut
2 half-lives
They decay at a predictable rate
it turns into a new element
Devonian
on the bottom
short lived and found in many locations
all of the above are the same number
Earth is
younger than the layers they cut
2 half-lives
They decay at a predictable rate
it turns into a new element
Devonian
on the bottom
short lived and found in many locations
all of the above are the same number
Radioactive isotopes are used to date rocks and fossils because
younger than the layers they cut
2 half-lives
They decay at a predictable rate
it turns into a new element
Devonian
on the bottom
short lived and found in many locations
all of the above are the same number
A fault, folding, tilting, intrusions or extrusions are
younger than the layers they cut
2 half-lives
They decay at a predictable rate
it turns into a new element
Devonian
on the bottom
short lived and found in many locations
all of the above are the same number
When examining layers of rocks, the oldest layer can be found
younger than the layers they cut
2 half-lives
They decay at a predictable rate
it turns into a new element
Devonian
on the bottom
short lived and found in many locations
all of the above are the same number
A good index fossil will be
younger than the layers they cut
2 half-lives
They decay at a predictable rate
it turns into a new element
Devonian
on the bottom
short lived and found in many locations
all of the above are the same number
Most of the rocks found in Western New York are from the geologic time period know as
younger than the layers they cut
2 half-lives
They decay at a predictable rate
it turns into a new element
Devonian
on the bottom
short lived and found in many locations
all of the above are the same number
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