The giant gypsum crystals in Mexico’s “Cueva de los Cristales” are a stunning natural wonder featuring crystals up to 11 metres long.
These giant gypsum (hydrated calcium sulphate) crystals in the “Cave of Crystals” in the Naica mine, Chihuahua, Mexico pose an interesting problem: how are they formed. A Spanish-Mexican team led by Prof García-Ruiz et al. propose that these crystals are derived from “a self-feeding mechanism driven by a solution-mediated, anhydrite-gypsum phase transition”.
WebElements December 15th, 2009
Posted In: Chemistry
Virginia Tech (USA) researchers found that calcium intake among US adolescents has remained constant, if inadequate, since the 1970s and does not appear to be linked to soft drink consumption.1 Milk consumption among adolescent girls is low, with this group falling far below recommended dietary levels of calcium consumption. So drink some milk!
Conclusion: carbonated soft drink consumption among adolescent girls is modest and does not appear to be linked to decreased calcium intake.
WebElements December 14th, 2009