Answer:
iron
Step-by-step explanation:
The Earth's core is composed of two nuclei, one external and one internal.
External core
It is located on the inner core, almost three thousand kilometers away from the earth's surface. It is a liquid composed of iron and nickel in the form of an alloy, whose thickness reaches approximately 2,300 kilometers.
This core has a temperature close to 5,000 degrees Celsius, however, it is not high enough to solidify the liquid that makes it up.
Scientists believe that this nucleus is the cause of various terrestrial magnetic and electrical phenomena.
Internal core
It is the hottest place on Earth, temperatures range between 5,000 and 7,000 degrees Celsius.
It is composed of solid iron; however, it withstands both high temperatures and pressure and does not melt. It has an approximate radius of 1,200 kilometers.
This nucleus was discovered in 1936 by the Danish seismologist Inge Lehmann. Scientists, after various analyzes and calculations, have determined that the inner core has a rotational movement and that it is a degree faster than the surface rotation.