| http://www.w3.org/ns/prov#value | - Silicon almost always occurs in combination with oxygen, and a number of naturally-occurring minerals (such as quartz) are pure, or nearlypure, silicon dioxide.??????Thus, based on the very low toxicity of silica, amorphous, fumed (crystalline free), the Agency has determined that there is a reasonable certainty of no harm to the U.S. population, including infants and children, from aggregate expo
|
