Within the academic discipline of cultural anthropology, according to the OED, matriarchy is a culture or community in which such a system prevails or a family, society, organization, etc., dominated by a woman or women. In general anthropology, according to William A. Haviland, matriarchy is rule by women.
Sources of sulfur dioxide pollution In 1963, more than 23 million tons of sulfur dioxide were discharged into the atmosphere of the United States. The fossil-fueled power plant is the chief contributor to sulfur dioxide emissions and accounts for over 40% of the total emission.
Due to its small size (and thus its small gravity), Mercury has no substantial atmosphere. Its extremely thin atmosphere mostly consists of a small amount of helium and traces of sodium, potassium, and oxygen. These gases derive from the solar wind, radioactive decay, meteor impacts, and breakdown of Mercury's crust.