[Solved] The United States has active mines within its boundaries that are sufficient to maintain a steady supply of all important metals. Group Boundaries: The implicit or explicit rules and criteria that define who belongs to a particular group and who does not. Freudian Concept: Ideas or theories developed by Sigmund Freud that focus on unconscious desires, motivations, and the influence of childhood experiences. Violent Pornography: Media content that combines sexually explicit material with acts of violence, potentially influencing attitudes and behaviors towards aggression and sexual consent. Tolerant Light: A concept likely pertaining to the ability of certain organisms or materials to withstand exposure to light without adverse effects; though it is not a widely recognized term in scientific literature.