Health risks associated with exposure to NOA are not yet fully understood, and current US federal regulations do not address exposure from NOA . Many populated areas are in proximity to shallow, natural deposits which occur in 50 of 58 California counties and in 19 other US states.
32.
Over time many of the oak properties get " leached " out of the barrel with layers of natural deposits left from the wine building up on the wood to where after 3 to 5 vintages there may be little or no oak flavors imparted on the wine.
33.
Whether or not the shell heaps scattered in coastal and riparian locations throughout Florida were natural deposits or of human origin remained a matter of debate in the mid-19th century, although Daniel Brinton had come to the conclusion by 1859 that the shell mounds on the east coast of Florida were the waste heaps of aboriginal groups that had accumulated over centuries.
34.
The range of natural deposits tied to gold-microbe interplay is on the rise, said Dr . Gordon Southam, a geomicrobiologist at Northern Arizona University in Flagstaff, Ariz . His research links the life factor to gold placers, deposits found around the globe that are traditionally seen as formed by weathering and the separation of rocks of differing densities in places like swift-running rivers.
