These are created by radiation of many kinds, some coming from above, such as cosmic rays, and some from rocks, such as the decay
of radioactive minerals.
This
uses radioactive minerals that occur in If you are looking for the best online dating site, then you come to the right place.
Thomas Sisson of the survey's division in Menlo Park, California, mapped subtle variations in the composition of rock formations and divined their ages by
dating radioactive minerals.
Nitrate mobilizes naturally occurring uranium through a series of bacterial and chemical reactions that oxidize
the radioactive mineral, making it soluble in groundwater.