Oceanography

The Core

Core is the innermost portion of the earth . The core of the earth begins 2,900 kilometers below earth surface and extends up to 3,480 kilometers to the center of the earth. Seismic studies have shown the existence of two cores: the outer liquid core and the inner solid core. The inner core is comprised of an alloy of iron and nickel. The iron alloy constitutes about 80 to 85 percent of the inner core; nickel and other unknown elements comprise the remainder percent.