Silver is a whitish precious metal and has been used since about 4000 BC for various purposes such as money, silverware, jewelry and so on. Silver is measured in troy ounces. A troy ounce is 31.10348 grams.
Food Desert Locator from the USDA. GoodFood World Staff, May 4th, 2011. The official definition of a food desert is a low income census tract where at least a third of the residents are a mile from a supermarket or large grocery store.
Ranges of Food Security and Food Insecurity. In 2006, USDA introduced new language to describe ranges of severity of food insecurity. USDA made these changes in response to recommendations by an expert panel convened at USDA's request by the Committee on National Statistics (CNSTAT) of the National Academies.