The outer core of the Earth is a fluid layer about 2,400 km (1,500 mi) thick and composed of mostly iron and nickel that lies above Earth's solid inner core and below its mantle. Its outer boundary lies 2,890 km (1,800 mi) beneath Earth's surface. Unlike the inner core, the outer core is liquid. read more
The only liquid layer of the earth is the outer core. The inner core is solid because of the intense pressure from the other layers, and the other layers are made of igneous rock. However, the inner and outer core have the same composition: iron and nickel. read more
The layer of the earth in liquid form is the mantle. It is made up of magma and lies directly beneath the earth's crust. This liquid is responsible for moving continents and earthquakes. read more
The interior structure of the Earth is layered in spherical shells: an outer silicate solid crust, a highly viscous asthenosphere and mantle, a liquid outer core that is much less viscous than the mantle, and a solid inner core. read more