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.
1 Calcium is the main component of teeth and bones. 2  Calcium is the fifth most abundant element in the human body. 3  Approximately one third of the mass of the human body is calcium after all water is removed.4  Calcium burns with a dark red color in a flame test. 5  Calcium is used in fireworks to deepen the color. Calcium is the main component of teeth and bones. 2  Calcium is the fifth most abundant element in the human body. 3  Approximately one third of the mass of the human body is calcium after all water is removed.