What type of farming Provides the basic needs of the family with little or no surplus

The causes of the failure of the league of nations

List 3 factors commonly used to select the location of a city

The first atomic explosion was detonated in the desert north of alamogordo, new mexico, on july 16, 1945. what percentage of the strontium-90 ( yr) originally produced by that explosion still remains as of july 16, 2016?