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