Quiz three
Which of these is not required criteria for considering something a resource
Currently exploitableoi
Parent Potassium40
Daughter Aargon40
Parent Uranium238
Daughter Lead206
Parent Uranium235
Daughter Lead207
Parent Thorium232
Daughter Lead208
Parent Rubidum87
Daughter Strontium87
Ore
Metal bearing rock that can be minded for a profit
If a rock sample contains 23% of a radioactive parent isotope relative to its stable daughter isotope what can be said about the age of the rock if the half-life. For this isotope is 125 million years okd
The rock is between 250 and 375 million years old but is closer to 250
Uranium238 Lead206
4.5 billion years
Rubidium 87 Strontium87
47 billion years ago
After one half life what is the percentage of parent and daughter istope
50:50
Uranium235 Lead207
704 million years ago
An istope of an element is atom that may contain
Additional neutrons which increase the atomic weight of the element
If a sample rock is radiometrically dates and it is later discovered that some of the parent isotope may have been removed from the sample by weathering, the absolute age date that was obtained will be
Artificially oldq
What geologic period immediately follows the Paleozoic
Triassic
What is the source of natural carbon 14
Comics ray collisions and nuclear changes involving atmospheric nitrogen
Potassium 40 Aargon40
1.3 billion years
Thorium232 Lead208
14.1 billion years ago
Resource
A naturally occurring concentration of a commodity whose exploitation is either currently, or potentially, fesiable
Which of the following specimens would carbon 14 dating work for
A piece of wood from a recent glaciation
Reserve
A resource who exploration is currently feasible
Mineral resource
Any deposit on earth that could be mined
Mineral reserve
Any deposit that came mined from a profit
