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(These include the variety of elements used in ‘standard’ radioisotope dating, mature uranium radiohalos and fission track dating.) It would be hard to imagine that geologic processes alone could explain all these.
Rather, there was likely to be an answer that concerned the nuclear decay processes themselves.
more Closed system: A system (rock, planet, etc.) which has no influence or exchange with the outside world.
Others had tried to find an answer in geological processes—e.g.
the pattern was caused by the way the magma was emplaced or how it crystallized. But Drs Humphreys and Baumgardner realized that in other cases there were many independent lines of evidence that suggested that huge amounts of radioactive decay had indeed taken place.
There are three standard creationist responses: First, creationists assert that current rates (Y) are different than past rates.
It is possible that these rates changed — but under uniformitarianism, which is necessary for science to function, we must assume that rates did not change unless there is evidence for this change.
By 1830 Lyell's famous textbook, Principles of Geology, came out. Such was the age of the great creationist geologists!