Astronomy, Guide to Space. The oxygen cycle is the cycle that helps move oxygen through the three main regions of the Earth, the Atmosphere, the Biosphere, and the Lithosphere. The Atmosphere is of course the region of gases that lies above the Earthâs surface and it is one of the largest reservoirs of free oxygen on earth.
Blackwell family members include Elizabeth Blackwell, the first woman in America to receive a medical degree; her sister Emily, also a physician; their brother Henry, a noted abolitionist and womenâs suffrage activist; his wife, Lucy Stone, the famous womenâs suffrage leader; their daughter, Alice Stone Blackwell, active in both suffrage and ...
1910 Elizabeth Blackwell: 1st woman physician, dies at 89; 1916 Horace Hood: British spy (Battle of Jutland), dies in battle; 1928 Ludwig Enneccerus: German leader, dies at 85; 1928 Manuel de Oliveira Lima: Brazilian historian, dies at 60; 1947 Adrienne Ames: Actress (Black Sheep, 24 Hours), dies at 39; 1948 Jose Vianna da Motta: Composer, dies at 80