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.
Definition of Calcium. It is the most abundant mineral in the human body. About 99% is present in bones and teeth, and the remainder in blood, muscles and nerves. Classification is the term for te hardening of bones and teeth. This is due to the absorption of calcium and phosphorus (calcium phosphate). Sources of Calcium.