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 ...
Stone's 1855 marriage to Henry Blackwell, a fellow suffragist and abolitionist, became well-known when the couple recited vows that proclaimed their equality as a married couple, and Stone openly retained her maiden name.