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.
What defines a desert? A desert is defined simply by the amount of rainfall that falls in an area in conjunction with the amount of evaporation. In essence, its any area that receives on average less than 10 inches of rainfall per year, and where the yearly evaporation is more than 10 inches of rain a year. Where are deserts found? Deserts are found around the globe, generally around a belt of 30 degrees north and south latitude where global wind patterns carry down dry air from the upper atmosphere.