Third layer of Earth which comes after the Mantle of Earth is known as _____________.
A) The Inner Core
B) The Crust
C) The Outer Core
D) The Mantle

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Hint:
This part of the core is also created with iron and nickel, just in liquid form. It sits roughly 5,180 km to 2,880 km below the exterior. Heated mainly by the radioactive deterioration of the components uranium and thorium, this liquid roils in enormous, raging streams.

Complete answer:
The centre of the Earth is made up of 2 layers, the outer core and the inner core. The outer core is the 3rd tier of the Earth. It is the lone fluid layer and is mostly made up of metals such as iron and nickel, as well as small measures of additional materials. The outer core is accountable for Earth’s magnetic field. As the Earth spins on its axis, the iron within the liquid outer core shifts about. The traffic instigates controlling electric fluxes to grow in the liquid iron itself. These controlling fluxes instigate lines of indiscernible strength to enlarge around the Earth and thousands of miles into space, generating a magnetic field. The magnetic field guards the Earth against destructive elements that originate from the Sun. Earth's outer core is a watered-down layer about 2,400 km impenetrable and compiled of, typically, iron and nickel that lies above Earth's solid inner core and beneath its mantle. Its outer border lies 2,890 km below Earth's surface.

Thus, option (C) is correct.

Note:
The temperature is $6740{\text{ - }}13940^\circ {\text{F}}$ adjacent to the inner core. Verification for a watery outer core contains from seismology which demonstrates that seismic shear-waves are not spread through the outer core. Due to its high temperature, exhibiting work has revealed that the outer core is a low-viscosity liquid that convects wildly. The dynamo theory perceives eddy fluxes in the nickel-iron liquid of the outer core as the major source of the Earth's magnetic field. The outer core is not under adequate compression to be solid, so it is liquid even though it has a configuration parallel to the inner core. Sulphur and oxygen could be existing in the outer core.