NCHHSTP Social Determinants of Health. Definitions. The National Center for HIV/AIDS, Viral Hepatitis, STD, and TB Prevention uses the words below to describe health equity and social determinants of health. These words are also used by the World Health Organization and the Department of Health and Human Service's Healthy People 2020.
Scientists have narrowed down several of the most likely causes of mass extinction. Flood basalt events (volcano eruptions), asteroid collisions, and sea level falls are the most likely causes of mass extinctions, though several other known events may also contribute. These include global warming, global cooling, methane eruptions and anoxic eventsâwhen the earth's oceans lose their oxygen.
Kirk Janowiak, Eclectic, educated, and loves to teach. Views. There is only one cause for mass extinctions and that is a major or equally massive change in the environment a large scale. Any wide-scale event or series of events that can alter the regional or global climate and/or environment over a large area can, thus, trigger a mass extinction. Such events might include: