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.
A rural food desert is generally classified as a county where residents must drive more than 10 miles to the nearest supermarket chain or supercenter, whereas an urban food desert is classified as having to drive more than a mile. Using this definition, twenty percent of rural counties are considered food deserts.tandards of access and methods of measurement vary among researchers to determine food deserts; some researchers classify food desert areas as those one to ten miles away from the nearest supermarket. Others identify food deserts as âareas with 10 or fewer stores with no more than 20 employeesâ.