Instrument data from three buoys in Lake Superior provide a reliable record of water temperatures since about 1980, and the information also shows that, with water temperatures running in the mid-to-upper 60s (and even warmer closer to shore), âwe are at record temperatures for this time of year,â according to Austin.
The talc is formed by the alteration of sedimentary magnesium carbonate rocks (dolomite and magnesite) at elevated temperature and pressure below the earth's surface. While the magnesium is fixed in situ, the silica is transported by silica-containing hot fluids to react with the Magnesium- bearing carbonates to form talc. These altered rocks are then talc-rich dolomites or magnesites. This type of deposits usually deliver the massive talcs accompanied by carbonates, chlorite and some quartz.
The decision wasn't actually based on hard evidence of a known link between talc and ovarian cancer, leading to a lot of confusion for consumers. Baby powder's main ingredient is talc -- a natural product made of magnesium, silicon, hydrogen and oxygen. In addition to baby powder, talc is found in a lot of cosmetic products. Talc baby powder was used for decades for diapering babies until concerns over the effects of inhalation on infants led physicians to recommend against its use.