Hace 19 horas · James Earl Carter Jr. (born October 1, 1924) is an American politician and humanitarian who served as the 39th president of the United States from 1977 to 1981. A member of the Democratic Party, Carter was the 76th governor of Georgia from 1971 to 1975, and a Georgia state senator from 1963 to 1967.
Hace 19 horas · The Holocaust The Holocaust was the genocide of European Jews during World War II. Between 1941 and 1945, Nazi Germany and its collaborators systematically murdered some six million Jews across German-occupied Europe, around two-thirds of Europe's Jewish population.
Hace 19 horas · Chemical properties General chemistry It tarnishes slightly when exposed to air, although, unlike the heavier alkaline earth metals, an oxygen-free environment is unnecessary for storage because magnesium is protected by a thin layer of oxide that is fairly impermeable and difficult to remove. 
Hace 19 horas · The United Nations Convention on the Rights of Persons with Disabilities defines disability as: long-term physical, mental, intellectual or sensory impairments which in interaction with various barriers may hinder [a person's] full and effective participation in society on an equal basis with others. 
Hace 19 horas · Zinc Zinc is a chemical element; it has symbol Zn and atomic number 30. Zinc is a slightly brittle metal at room temperature and has a shiny-greyish appearance when oxidation is removed. It is the first element in group 12 (IIB) of the periodic table.