 One might at this point question why the analyses of moral terms analytic naturalism constructs would be naturalistic, i.e., define moral terms in purely “descriptive” terms, given that the roles played by moral terms are partly determined by their relations to other moral terms. A crucial element of the view that we must now explain addresses this question. Analytic naturalism holds that a central tenet of folk morality is that moral properties supervene on natural properties. This means that it is impossible for two situations to differ morally without there also being some natural difference. Jackson argues that the supervenience of the moral on the natural, or as he prefers, on the “descriptive”, entails that moral properties are natural properties.