The core of the Earth is a layer located at the center of the Earth. It is the innermost part and is made up of two parts, the inner core and the outer core. The inner core is solid while the outer core is liquid. Another name for the core of the Earth is barysphere. The term barysphere is derived from the Greek word 'barys' which means heavy. This is because the core is the heaviest part of the Earth and contains a large proportion of the Earth's total mass.