Nat Turner led a slave revolt several years before the Civil War. The revolt failed and he was killed. he is known for leading 2 uprises in Virginia in 1831 before getting caught.
Calcium (Ca), chemical element, one of the alkaline-earth metals of Group 2 (IIa) of the periodic table. It is the most abundant metallic element in the human body and the fifth most abundant element in Earthâs crust.
Calcium does not occur as a free element in nature. It is typically found as a compound and is much too active to be found in its pure form. But, the most common Calcium compound is Calcium Carbonate (limestone, chalk, marble, oyster shells, coral etc).