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 is a soft gray alkaline earth metal and is the fifth-most-abundant element through mass in the Earth's crust. Calcium is also the fifth most abundant mixed ion in seawater by both mass and molarity, following chloride, sodium, sulfate and magnesium.alcium is a soft gray alkaline earth metal and is the fifth-most-abundant element through mass in the Earth's crust. Calcium is also the fifth most abundant mixed ion in seawater by both mass and molarity, following chloride, sodium, sulfate and magnesium.