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.